feat: migrate SQLAlchemy from 1.4 to 2.0 with ORM style

- Remove encode/databases dependency, use native SQLAlchemy 2.0 async
- Convert all table definitions to Declarative Mapping pattern
- Update all controllers to accept session parameter (dependency injection)
- Convert all queries from Core style to ORM style
- Remove PostgreSQL compatibility checks (PostgreSQL only now)
- Add proper typing for engine and session factories

server/uv.lock

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@@ -3100,9 +3080,9 @@ dependencies = [
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     { name = "aiortc" },
     { name = "alembic" },
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