docs: update LICENSE, README, architecture diagram

architecture.mmd

@@ -0,0 +1,64 @@
+graph TD
+    subgraph Presentation
+        MAIN[main.rs]
+        ROUTES[routes/]
+        EXTRACT[extractors]
+        OPENAPI[OpenAPI / Scalar]
+        SPA[SPA static files]
+    end
+
+    subgraph Application
+        SONGS_UC[songs/]
+        TABS_UC[tabs/]
+        AUTH_UC[auth/]
+    end
+
+    subgraph Domain
+        MODELS[models/]
+        VO[value_objects/]
+        PORTS[ports/]
+        SERVICES[services/]
+        ERRORS[errors/]
+    end
+
+    subgraph Adapters
+        SQLITE[(SQLite)]
+        UG[UG Parser]
+        JWT[JWT + Argon2]
+    end
+
+    subgraph "Shared Crates"
+        API_TYPES[api-types]
+        INFRA[infra-wiring]
+    end
+
+    subgraph Frontend
+        REACT[React SPA]
+    end
+
+    MAIN --> ROUTES
+    MAIN --> OPENAPI
+    ROUTES --> EXTRACT
+    ROUTES --> SONGS_UC
+    ROUTES --> TABS_UC
+    ROUTES --> AUTH_UC
+    ROUTES --> API_TYPES
+
+    SONGS_UC --> PORTS
+    TABS_UC --> PORTS
+    AUTH_UC --> PORTS
+
+    PORTS --> MODELS
+    PORTS --> VO
+    PORTS --> ERRORS
+    SERVICES --> MODELS
+    SERVICES --> VO
+
+    SQLITE -.->|implements| PORTS
+    UG -.->|implements| PORTS
+    JWT -.->|implements| PORTS
+
+    MAIN --> INFRA
+    MAIN --> SPA
+    REACT -->|/api/*| ROUTES
+    SPA -->|serves| REACT