feat(tui): add usage overlay and sidebar for displaying usage statistics and tasks

feat(tui): implement status bar with connection and turn state indicators
feat(tui): create workflow panel for agent status and progress visualization
feat(web): introduce web frontend interface with static file serving
feat(ws): add WebSocket interface for real-time communication and session management

apps/domain/src/lib.rs

@@ -0,0 +1,52 @@
+//! # Zesdex Domain Layer
+//!
+//! Pure domain entities, value objects, repository traits, and service traits
+//! for the Zesdex application. This crate has **zero framework dependencies**
+//! — it depends only on serialization (`serde`), timestamping (`chrono`),
+//! identity (`uuid`), and a few other narrowly-scoped utilities.
+//!
+//! ## Architecture
+//!
+//! ```text
+//! apps/domain
+//! ├── core/       Shared domain entities (Conversation, Message, Provider,
+//! │               Store, ToolCall, ToolResult, Usage)
+//! ├── auth/       Authentication domain (Session, SessionId, SessionLock,
+//! │               OAuth, commands, errors, repository/service traits)
+//! ├── cms/        CMS domain (AppConfig, Conversation, EditLog, Memory,
+//! │               Settings, commands, errors, repository/service traits)
+//! └── error.rs    Unified DomainError type
+//! ```
+//!
+//! ## Key Design Principle
+//!
+//! All types are pure Rust structs and enums with `serde` derives. No I/O,
+//! no framework imports, no side effects. All persistence is expressed
+//! through repository traits that infrastructure adapters implement.
+
+pub mod auth;
+pub mod cms;
+pub mod core;
+pub mod error;
+
+// Re-export all public items from each module for ergonomic imports.
+// Consumers can do `use zesdex_domain::*` for common types.
+pub use auth::{
+    IamSession, NewSession, OAuthConfig, OAuthToken, OAuthRepository, OAuthService,
+    RepositoryError as AuthRepositoryError, ServiceError as AuthServiceError, Session,
+    SessionId, SessionLock, SessionLockRepository, SessionRepository, SessionService,
+};
+pub use cms::{
+    AppConfig, AppConfigRepository, Conversation as CmsConversation,
+    ConversationRepository, ConversationService, EditLog, EditLogEntry,
+    EditLogRepository, InternetMode, Memory, MemoryRepository, MemoryService,
+    ModelRole, NewMemory, ProviderConfig, RepositoryError as CmsRepositoryError,
+    ServiceError as CmsServiceError, Settings, SettingsFlags, SettingsPatch,
+    SettingsRepository, SettingsService,
+};
+pub use core::{
+    ChatMessage, ChatRequest, ChatResponse, Choice, Conversation, Delta, Role,
+    SseParser, StreamEvent, StreamOptions, Store, TokenUsage, ToolCall,
+    ToolCallResult, ToolDef, ToolFunction, ToolFunctionDef, UsageStats,
+};
+pub use error::DomainError;