Dependabot有効化のため、一旦merge

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+  - package-ecosystem: npm
+    directory: /frontend/
+    schedule:
+      interval: daily

backend/README.md

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+# バックエンド

frontend/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

frontend/README.md

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+# フロントエンド

frontend/biome.json

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+{
+  "$schema": "https://biomejs.dev/schemas/2.2.5/schema.json",
+  "vcs": { "enabled": false, "clientKind": "git", "useIgnoreFile": false },
+  "files": { "ignoreUnknown": false },
+  "formatter": { "enabled": true, "indentStyle": "space", "indentWidth": 2 },
+  "linter": {
+    "enabled": true,
+    "rules": { "recommended": false },
+    "includes": ["**", "!dist"]
+  },
+  "javascript": { "formatter": { "quoteStyle": "double" } },
+  "overrides": [
+    {
+      "includes": ["**/*.{ts,tsx}"],
+      "linter": {
+        "rules": {
+          "complexity": {
+            "noAdjacentSpacesInRegex": "error",
+            "noExtraBooleanCast": "error",
+            "noUselessCatch": "error",
+            "noUselessEscapeInRegex": "error"
+          },
+          "correctness": {
+            "noConstAssign": "error",
+            "noConstantCondition": "error",
+            "noEmptyCharacterClassInRegex": "error",
+            "noEmptyPattern": "error",
+            "noGlobalObjectCalls": "error",
+            "noInvalidBuiltinInstantiation": "error",
+            "noInvalidConstructorSuper": "error",
+            "noNonoctalDecimalEscape": "error",
+            "noPrecisionLoss": "error",
+            "noSelfAssign": "error",
+            "noSetterReturn": "error",
+            "noSwitchDeclarations": "error",
+            "noUndeclaredVariables": "error",
+            "noUnreachable": "error",
+            "noUnreachableSuper": "error",
+            "noUnsafeFinally": "error",
+            "noUnsafeOptionalChaining": "error",
+            "noUnusedLabels": "error",
+            "noUnusedPrivateClassMembers": "error",
+            "noUnusedVariables": "error",
+            "useIsNan": "error",
+            "useValidForDirection": "error",
+            "useValidTypeof": "error",
+            "useYield": "error"
+          },
+          "suspicious": {
+            "noAsyncPromiseExecutor": "error",
+            "noCatchAssign": "error",
+            "noClassAssign": "error",
+            "noCompareNegZero": "error",
+            "noConstantBinaryExpressions": "error",
+            "noControlCharactersInRegex": "error",
+            "noDebugger": "error",
+            "noDuplicateCase": "error",
+            "noDuplicateClassMembers": "error",
+            "noDuplicateElseIf": "error",
+            "noDuplicateObjectKeys": "error",
+            "noDuplicateParameters": "error",
+            "noEmptyBlockStatements": "error",
+            "noFallthroughSwitchClause": "error",
+            "noFunctionAssign": "error",
+            "noGlobalAssign": "error",
+            "noImportAssign": "error",
+            "noIrregularWhitespace": "error",
+            "noMisleadingCharacterClass": "error",
+            "noPrototypeBuiltins": "error",
+            "noRedeclare": "error",
+            "noShadowRestrictedNames": "error",
+            "noSparseArray": "error",
+            "noUnsafeNegation": "error",
+            "noUselessRegexBackrefs": "error",
+            "noWith": "error",
+            "useGetterReturn": "error"
+          }
+        }
+      }
+    },
+    { "includes": ["**/*.{ts,tsx}"], "javascript": { "globals": [] } },
+    {
+      "includes": [
+        "**/*.{ts,tsx}",
+        "**/*.ts",
+        "**/*.{ts,tsx}",
+        "**/*.tsx",
+        "**/*.{ts,tsx}",
+        "**/*.mts",
+        "**/*.{ts,tsx}",
+        "**/*.cts"
+      ],
+      "linter": {
+        "rules": {
+          "complexity": { "noArguments": "error" },
+          "correctness": {
+            "noConstAssign": "off",
+            "noGlobalObjectCalls": "off",
+            "noInvalidBuiltinInstantiation": "off",
+            "noInvalidConstructorSuper": "off",
+            "noSetterReturn": "off",
+            "noUndeclaredVariables": "off",
+            "noUnreachable": "off",
+            "noUnreachableSuper": "off"
+          },
+          "style": { "useConst": "error" },
+          "suspicious": {
+            "noClassAssign": "off",
+            "noDuplicateClassMembers": "off",
+            "noDuplicateObjectKeys": "off",
+            "noDuplicateParameters": "off",
+            "noFunctionAssign": "off",
+            "noImportAssign": "off",
+            "noRedeclare": "off",
+            "noUnsafeNegation": "off",
+            "noVar": "error",
+            "noWith": "off",
+            "useGetterReturn": "off"
+          }
+        }
+      }
+    },
+    {
+      "includes": ["**/*.{ts,tsx}"],
+      "linter": {
+        "rules": {
+          "complexity": { "noUselessTypeConstraint": "error" },
+          "correctness": { "noUnusedVariables": "error" },
+          "style": {
+            "noCommonJs": "error",
+            "noNamespace": "error",
+            "useArrayLiterals": "error",
+            "useAsConstAssertion": "error"
+          },
+          "suspicious": {
+            "noExplicitAny": "error",
+            "noExtraNonNullAssertion": "error",
+            "noMisleadingInstantiator": "error",
+            "noUnsafeDeclarationMerging": "error",
+            "useNamespaceKeyword": "error"
+          }
+        }
+      }
+    },
+    {
+      "includes": ["**/*.{ts,tsx}"],
+      "linter": {
+        "rules": {
+          "correctness": {
+            "useExhaustiveDependencies": "warn",
+            "useHookAtTopLevel": "error"
+          }
+        }
+      }
+    },
+    { "includes": ["**/*.{ts,tsx}"], "linter": { "rules": {} } },
+    {
+      "includes": ["**/*.{ts,tsx}"],
+      "javascript": {
+        "globals": [
+          "onanimationend",
+          "ongamepadconnected",
+          "onlostpointercapture",
+          "onanimationiteration",
+          "onkeyup",
+          "onmousedown",
+          "onanimationstart",
+          "onslotchange",
+          "onprogress",
+          "ontransitionstart",
+          "onpause",
+          "onended",
+          "onpointerover",
+          "onscrollend",
+          "onformdata",
+          "ontransitionrun",
+          "onanimationcancel",
+          "ondrag",
+          "onchange",
+          "onbeforeinstallprompt",
+          "onbeforexrselect",
+          "onmessage",
+          "ontransitioncancel",
+          "onpointerdown",
+          "onabort",
+          "onpointerout",
+          "oncuechange",
+          "ongotpointercapture",
+          "onscrollsnapchanging",
+          "onsearch",
+          "onsubmit",
+          "onstalled",
+          "onsuspend",
+          "onreset",
+          "onerror",
+          "onresize",
+          "onmouseenter",
+          "ongamepaddisconnected",
+          "ondragover",
+          "onbeforetoggle",
+          "onmouseover",
+          "onpagehide",
+          "onmousemove",
+          "onratechange",
+          "oncommand",
+          "onmessageerror",
+          "onwheel",
+          "ondevicemotion",
+          "onauxclick",
+          "ontransitionend",
+          "onpaste",
+          "onpageswap",
+          "ononline",
+          "ondeviceorientationabsolute",
+          "onkeydown",
+          "onclose",
+          "onselect",
+          "onpageshow",
+          "onpointercancel",
+          "onbeforematch",
+          "onpointerrawupdate",
+          "ondragleave",
+          "onscrollsnapchange",
+          "onseeked",
+          "onwaiting",
+          "onbeforeunload",
+          "onplaying",
+          "onvolumechange",
+          "ondragend",
+          "onstorage",
+          "onloadeddata",
+          "onfocus",
+          "onoffline",
+          "onplay",
+          "onafterprint",
+          "onclick",
+          "oncut",
+          "onmouseout",
+          "ondblclick",
+          "oncanplay",
+          "onloadstart",
+          "onappinstalled",
+          "onpointermove",
+          "ontoggle",
+          "oncontextmenu",
+          "onblur",
+          "oncancel",
+          "onbeforeprint",
+          "oncontextrestored",
+          "onloadedmetadata",
+          "onpointerup",
+          "onlanguagechange",
+          "oncopy",
+          "onselectstart",
+          "onscroll",
+          "onload",
+          "ondragstart",
+          "onbeforeinput",
+          "oncanplaythrough",
+          "oninput",
+          "oninvalid",
+          "ontimeupdate",
+          "ondurationchange",
+          "onselectionchange",
+          "onmouseup",
+          "location",
+          "onkeypress",
+          "onpointerleave",
+          "oncontextlost",
+          "ondrop",
+          "onsecuritypolicyviolation",
+          "oncontentvisibilityautostatechange",
+          "ondeviceorientation",
+          "onseeking",
+          "onrejectionhandled",
+          "onunload",
+          "onmouseleave",
+          "onhashchange",
+          "onpointerenter",
+          "onmousewheel",
+          "onunhandledrejection",
+          "ondragenter",
+          "onpopstate",
+          "onpagereveal",
+          "onemptied"
+        ]
+      }
+    }
+  ],
+  "assist": {
+    "enabled": true,
+    "actions": { "source": { "organizeImports": "on" } }
+  }
+}

frontend/index.html

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+<!DOCTYPE html>
+<html lang="ja">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>project-experiment</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

frontend/package.json

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+{
+  "name": "project-experiment",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview",
+    "check": "biome check",
+    "check:fix": "biome check --write"
+  },
+  "dependencies": {
+    "react": "^19.1.1",
+    "react-dom": "^19.1.1"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "2.2.5",
+    "@types/node": "^24.6.0",
+    "@types/react": "^19.1.16",
+    "@types/react-dom": "^19.1.9",
+    "@vitejs/plugin-react": "^5.0.4",
+    "globals": "^16.4.0",
+    "typescript": "^5.9.3",
+    "vite": "npm:rolldown-vite@7.1.14"
+  },
+  "pnpm": {
+    "overrides": {
+      "vite": "npm:rolldown-vite@7.1.14"
+    }
+  }
+}