feat: add comprehensive CLI with API client, session management, and data seeding

- Binary renamed from 'api' to 'xevion' with full CLI command structure
- Authentication: login/logout with session persistence to .xevion-session
- API commands: projects, tags, settings CRUD operations with JSON/table output
- Serve command: run production server with configurable listen addresses
- Seed command: moved from bin/ to CLI subcommand for database initialization
- HTTP client abstraction supporting both TCP and Unix socket connections

web/entrypoint.ts

@@ -63,7 +63,7 @@ while (!existsSync(BUN_SOCKET)) {
 console.log("Starting Rust API...");
 const rustProc = spawn({
   cmd: [
-    "/app/api",
+    "/app/xevion",
     "--listen",
     `[::]:${PORT}`,
     "--listen",