fix(vercel): route requests to the app again after rewrite semantics change

Vercel's builder (CLI 56.5.0 -> 58.1.0) changed internal rewrites in backend
framework projects to route using the rewritten destination path. Every path was
rewritten to /api/index, so FastAPI stopped seeing real paths: each request fell
through to the SPA catch-all and returned the landing page. /app looked like a
dead "Launch Plan-It" button, /health returned HTML, and /css/app.css was served
as text/html.

Vercel now detects this as a FastAPI project on its own, so the rewrites are
redundant as well as harmful. Drop them and pin the entrypoint so detection is
unambiguous between api/index.py and app/main.py.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: jssturm

pyproject.toml

@@ -49,6 +49,9 @@ Issues      = "https://github.com/jssturm/Plan-It/issues"
 [project.scripts]
 plan-it = "app.cli:main"
 
+[tool.vercel]
+entrypoint = "app.main:app"
+
 [tool.setuptools.packages.find]
 include = ["app", "app.*"]
 

vercel.json

@@ -1,11 +1,3 @@
 {
-  "buildCommand": "pip install -r requirements.txt",
-  "rewrites": [
-    { "source": "/health", "destination": "/api/index" },
-    { "source": "/travel", "destination": "/api/index" },
-    { "source": "/travel/(.*)", "destination": "/api/index" },
-    { "source": "/start-day", "destination": "/api/index" },
-    { "source": "/app", "destination": "/api/index" },
-    { "source": "/(.*)", "destination": "/api/index" }
-  ]
-}
+  "buildCommand": "pip install -r requirements.txt"
+}