feat(cors): add CORS configuration and FastAPI app setup

- Add FRONTEND_URL to settings for CORS configuration
- Create main.py with FastAPI app, CORS middleware, and routers
- Implement lifespan management for database initialization

core/config.py

@@ -8,6 +8,9 @@ class Settings(BaseSettings):
     APP_NAME: str = "Makhfi AI"
     APP_VERSION: str = "0.1.0"
 
+    # --- CORS ---
+    FRONTEND_URL: str
+    
     # --- Supabase Configuration ---
     SUPABASE_KEY: str
     SUPABASE_URL: str

main.py

@@ -0,0 +1,44 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from contextlib import asynccontextmanager
+
+from api.routers import chats
+from api.routers import memory
+from db.session import create_db_and_tables
+from core.config import get_settings
+
+settings = get_settings()
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    print(f"INFO:     Starting up {settings.APP_NAME} v{settings.APP_VERSION}...")
+    create_db_and_tables()
+    print("INFO:     Database tables checked/created.")
+    yield
+    print(f"INFO:     Shutting down {settings.APP_NAME}...")
+
+# FastAPI app instance
+app = FastAPI(
+    title=settings.APP_NAME,
+    description=f"An API for interacting with {settings.APP_NAME}.",
+    version=settings.APP_VERSION,
+    lifespan=lifespan
+)
+
+# --- Middleware ---
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[settings.FRONTEND_URL],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# --- Routers ---
+app.include_router(chats.router, prefix="/api/chats", tags=["Chats & Messages"])
+app.include_router(memory.router, prefix="/api/memories", tags=["Memory Management"])
+
+# --- Root Endpoint ---
+@app.get("/", tags=["Health"])
+async def read_root():
+    return {"status": "ok", "message": "Welcome to Makhfi AI!"}