feat(settings): improve modal UX and unify model formats

- Unify all model lists to use Anthropic format (proxy translates)
- Rename "Model Provider" to "Model List Provider" for clarity
- Add subtitle "All models use your Claude subscription"
- Add "Test Models" button with /test-models endpoint
- Move fallback toggle to per-tier switches next to each model

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: joachimBrindeau

.mcp.json

@@ -0,0 +1,21 @@
+{
+  "mcpServers": {
+    "cloudflare": {
+      "type": "stdio",
+      "command": "npx",
+      "args": ["-y", "@cloudflare/mcp-server-cloudflare"]
+    },
+    "chromadb": {
+      "type": "stdio",
+      "command": "uvx",
+      "args": [
+        "chroma-mcp",
+        "--client-type", "http",
+        "--host", "chroma.database.klarc.eu",
+        "--port", "443",
+        "--ssl", "true",
+        "--custom-auth-credentials", "ba51fe607f0490af36ac12a7ea785133ca00b37301ec5992a8b2b372204db2c4"
+      ]
+    }
+  }
+}