🧹 Remove unused legacy modules and functions

- Deleted quota.rs module (quota management not needed via HTTP)
- Removed legacy get_id_by_token GraphQL function
- Removed unused set_user_quota and increase_user_quota methods
- Cleaned up unused imports and legacy structs
- Simplified handlers/mod.rs to only expose universal_handler

Architecture now focused on core functionality:
- GET / (user info)
- GET /<filename> (file serving)
- POST / (file upload)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "quoter"
-version = "0.5.1"
+version = "0.5.3"
 edition = "2024"
 
 [dependencies]
@@ -8,7 +8,6 @@ futures = "0.3.30"
 serde_json = "1.0.143"
 actix-web = "4.11.0"
 actix-cors = "0.7.0"
-actix-files = "0.6.7"
 reqwest = { version = "0.12.23", features = ["json"] }
 sentry = { version = "0.42", features = ["tokio"] }
 uuid = { version = "1.18.0", features = ["v4"] }