fix(render): Use explicit paths for api/requirements.txt

- Remove rootDir (Render may auto-detect root requirements.txt first)
- Explicitly use 'pip install -r api/requirements.txt' in buildCommand
- Explicitly use 'cd api &&' in startCommand
- This ensures FastAPI dependencies are installed from api/requirements.txt

render.yaml

@@ -4,9 +4,8 @@ services:
     name: skill-seekers-api
     runtime: python
     plan: free
-    rootDir: api
-    buildCommand: pip install -r requirements.txt
-    startCommand: uvicorn main:app --host 0.0.0.0 --port $PORT
+    buildCommand: pip install -r api/requirements.txt
+    startCommand: cd api && uvicorn main:app --host 0.0.0.0 --port $PORT
     envVars:
       - key: PYTHON_VERSION
         value: 3.10