Clean up unused code and dependencies

- Remove commented-out code in Rust and TypeScript files
- Remove unused npm dependencies (@tauri-apps/plugin-http, @tauri-apps/plugin-sql, fuse.js)
- Remove commented imports in nuxt.config.ts
- Remove commented dependencies in Cargo.toml

src-tauri/Cargo.toml

@@ -21,8 +21,6 @@ serde = { version = "1.0.228", features = ["derive"] }
 
 [dependencies]
 tokio = { version = "1.47.1", features = ["macros", "rt-multi-thread"] }
-#libsqlite3-sys = { version = "0.31", features = ["bundled-sqlcipher"] }
-#sqlx = { version = "0.8", features = ["runtime-tokio-rustls", "sqlite"] }
 base64 = "0.22"
 ed25519-dalek = "2.1"
 fs_extra = "1.3.0"