chore: initial project setup

- Cargo init with dependencies (ratatui, crossterm, tokio, reqwest, rusqlite, serde, chrono, dirs)
- Module structure: domain/, ui/, infrastructure/
- Domain models (TaskList, Task, TaskStatus, SyncAction, SyncQueueItem)
- .gitignore for target/ and *.db
- Rustls-based TLS (no OpenSSL dependency)

Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "task_app"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ratatui = "0.28"
+crossterm = "0.28"
+tokio = { version = "1", features = ["full"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+rusqlite = { version = "0.32", features = ["bundled"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+chrono = { version = "0.4", features = ["serde"] }
+dirs = "6"
+url = "2"