fluxdown: Switch to Copy-based persist pattern

- Use pre_install/pre_uninstall copy-in/copy-out for flux_down.db and
  settings.json (app rewrites these files, breaking hardlinks)
- Keep bt_session and logs in persist (directories, junction works)
- Use $version variable in CLI note URL

Author: ExLei

bucket/fluxdown.json

@@ -21,7 +21,7 @@
         "  Edge: https://microsoftedge.microsoft.com/addons/detail/fluxdown/nglkkjbogjghekbhhcnccnpfedjbdhhd",
         "",
         "Command-line client:",
-        "  https://github.com/zerx-lab/FluxDown/releases/tag/cli-v0.2.1"
+        "  https://github.com/zerx-lab/FluxDown/releases/tag/cli-v$version"
     ],
     "architecture": {
         "64bit": {
@@ -34,19 +34,33 @@
         }
     },
     "pre_install": [
-        "if (!(Test-Path \"$dir\\flux_down.db\")) { New-Item -ItemType File \"$dir\\flux_down.db\" -Force | Out-Null }",
-        "if (!(Test-Path \"$dir\\settings.json\")) { Set-Content \"$dir\\settings.json\" '{}' -Encoding UTF8 }"
+        "'flux_down.db', 'settings.json' | ForEach-Object {",
+        "    if (Test-Path \"$persist_dir\\$_\") {",
+        "        Copy-Item \"$persist_dir\\$_\" \"$dir\\$_\" -Force",
+        "    } else {",
+        "        if ($_ -eq 'flux_down.db') {",
+        "            New-Item -ItemType File \"$dir\\$_\" -Force | Out-Null",
+        "        } else {",
+        "            Set-Content \"$dir\\$_\" '{}' -Encoding UTF8",
+        "        }",
+        "    }",
+        "}"
     ],
     "shortcuts": [
         [
             "flux_down.exe",
             "FluxDown"
         ]
     ],
+    "pre_uninstall": [
+        "'flux_down.db', 'settings.json' | ForEach-Object {",
+        "    if (Test-Path \"$dir\\$_\") {",
+        "        Copy-Item \"$dir\\$_\" \"$persist_dir\\$_\" -Force",
+        "    }",
+        "}"
+    ],
     "persist": [
-        "flux_down.db",
         "bt_session",
-        "settings.json",
         "logs"
     ],
     "checkver": {