fix: api script cross-platform

Updated the dev:api script to use `uv run` instead of a hardcoded virtual environment path.

Changes:
- replaced `.venv/bin/uvicorn` with `uv run uvicorn`

Reason:
The previous implementation relied on a POSIX-specific path, which breaks on Windows
(where executables are located in `.venv/Scripts`). Using `uv run` ensures the command
works consistently across different operating systems by resolving the environment automatically.

package.json

@@ -7,7 +7,7 @@
     "dev": "turbo run dev //#dev:api",
     "build": "turbo run build",
     "start": "turbo run start",
-    "dev:api": ".venv/bin/uvicorn api:app --host 0.0.0.0 --port 8000 --reload"
+    "dev:api": "uv run uvicorn api:app --host 0.0.0.0 --port 8000 --reload"
   },
   "workspaces": [
     "frontend"