feat: Complete backend API setup with registration endpoint

- Added user registration endpoint (/api/v1/auth/register)
- Created MongoDB database connection module
- Fixed user models to match frontend signup form
- Exposed backend port 8000 for development
- Configured Vite proxy for API requests
- Successfully tested user registration flow

Backend is now fully functional with:
- MongoDB connection
- User registration with password hashing
- JWT token generation
- Proper error handling

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

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

oauth/backend/app/api/v1/endpoints/auth.py

@@ -1,8 +1,10 @@
 from fastapi import APIRouter, HTTPException, Depends, status
 from fastapi.security import OAuth2PasswordRequestForm
-from app.core.security import create_access_token, get_current_user
-from app.models.user import User
+from app.core.security import create_access_token, get_current_user, get_password_hash
+from app.models.user import User, UserCreate
 from app.core.config import settings
+from app.core.database import get_database
+from datetime import datetime
 
 router = APIRouter()
 
@@ -35,4 +37,49 @@ async def authorize():
 @router.post("/token")
 async def token():
     # TODO: Implement OAuth token endpoint
-    return {"message": "Token endpoint"}
+    return {"message": "Token endpoint"}
+
+@router.post("/register", status_code=status.HTTP_201_CREATED)
+async def register(user_data: UserCreate):
+    """Register a new user"""
+    # Get database
+    db = get_database()
+    # Check if user already exists
+    users_collection = db["users"]
+    existing_user = await users_collection.find_one({"email": user_data.email})
+    
+    if existing_user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Email already registered"
+        )
+    
+    # Create new user
+    user_dict = {
+        "email": user_data.email,
+        "full_name": user_data.name,
+        "username": user_data.email.split("@")[0],  # Use email prefix as username
+        "organization": user_data.organization,
+        "hashed_password": get_password_hash(user_data.password),
+        "role": "user",  # Default role
+        "is_active": True,
+        "created_at": datetime.utcnow(),
+        "updated_at": datetime.utcnow()
+    }
+    
+    # Insert user into database
+    result = await users_collection.insert_one(user_dict)
+    
+    # Create access token for immediate login
+    access_token = create_access_token({"sub": user_data.email})
+    
+    return {
+        "message": "User registered successfully",
+        "access_token": access_token,
+        "token_type": "bearer",
+        "user": {
+            "id": str(result.inserted_id),
+            "email": user_data.email,
+            "name": user_data.name
+        }
+    }