feat: add Google OAuth, remote worker system, and file browser

- Google OAuth login with JWT session cookies, per-user project isolation
- Remote worker registration via WebSocket, execute_on_worker/list_workers agent tools
- File browser UI in workflow view, file upload/download API
- Deploy script switched to local build, added tori.euphon.cloud ingress

Cargo.toml

@@ -10,7 +10,7 @@ warnings = "deny"
 all = "deny"
 
 [dependencies]
-axum = { version = "0.8", features = ["ws"] }
+axum = { version = "0.8", features = ["ws", "multipart"] }
 tokio = { version = "1", features = ["full"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
@@ -29,3 +29,6 @@ tokio-util = { version = "0.7", features = ["io"] }
 nix = { version = "0.29", features = ["signal"] }
 pulldown-cmark = "0.12"
 jsonwebtoken = "9"
+axum-extra = { version = "0.10", features = ["cookie"] }
+base64 = "0.22"
+time = "0.3"