feat: add new encoder and restructure project

app/main.py

@@ -0,0 +1,20 @@
+from fastapi import FastAPI
+from app.config import settings
+from app.db import database, Base, engine
+from app.routes import shortener_router
+
+app = FastAPI()
+
+@app.on_event("startup")
+async def startup():
+    await database.connect()
+
+    # only create missing tables in dev environment
+    if settings.environment == "dev":
+        Base.metadata.create_all(bind=engine)
+
+@app.on_event("shutdown")
+async def shutdown():
+    await database.disconnect()
+
+app.include_router(shortener_router)