feat: full clean architecture refactor — domain → application → infrastructure → presentation

- Restructure from Modular MVC to Clean Architecture with 4 strict layers
- Domain: entities (anime/komik/proxy), Repository traits, typed errors
- Application: use case classes with proper error propagation
- Infrastructure: repository impls, parsers, Redis cache, HTTP/scraping, browser
- Presentation: Axum handlers, DTOs, AppState, router, AppError+IntoResponse
- Migrate all parsers (otakudesu, alqanime, komik) to native infra implementations
- Replace once_cell::sync::Lazy/OnceCell with std::sync::LazyLock/OnceLock
- Remove 150+ old files in modules/ and shared/ directories
- Remove once_cell from Cargo.toml dependencies
- Fix test/debug binaries to use new import paths
- Zero new clippy warnings

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib.rs

@@ -1,10 +1,30 @@
-// Library root - clean organized module structure
-// All modules organized into logical folders
+// Library root — clean architecture module structure
 
 // ============================================================================
-// Core Framework
+// Domain Layer — pure business logic, no framework dependencies
+// ============================================================================
+pub mod domain;
+
+// ============================================================================
+// Application Layer — use cases / business orchestration
+// ============================================================================
+pub mod application;
+
+// ============================================================================
+// Infrastructure Layer — implements domain ports
+// ============================================================================
+pub mod infrastructure;
+
+// ============================================================================
+// Presentation Layer — Axum handlers, DTOs, state, middleware
+// ============================================================================
+pub mod presentation;
+
+// ============================================================================
+// Core Framework & Infrastructure
 // ============================================================================
-pub mod app;
 pub mod bootstrap;
-pub mod modules;
-pub mod shared;
+pub mod config;
+pub mod events;
+pub mod observability;
+pub mod scheduler;