feat: initial Phase 1 implementation — core framework + Docker

- Data types (SManga, SChapter, Page, MangasPage, all Filter variants)
- Source interfaces (Source, CatalogueSource) with MD5-based ID generation matching Tachiyomi/Suwayomi
- HTTP client with per-host rate limiting, cookie jar, and 429 retry
- FlareSolverr v1 client (FLARESOLVERR_URL env)
- Generic GraphQL POST helper
- goquery HTML parser wrappers
- Source registry (panics on duplicate ID)
- Multi-stage Dockerfile (golang:1.26-alpine + distroless) and compose.yml (postgres, flaresolverr, app)

compose.yml

@@ -0,0 +1,40 @@
+services:
+  postgres:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: goyomi
+      POSTGRES_USER: goyomi
+      POSTGRES_PASSWORD: goyomi
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U goyomi -d goyomi"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  flaresolverr:
+    image: ghcr.io/flaresolverr/flaresolverr:latest
+    restart: unless-stopped
+    environment:
+      LOG_LEVEL: info
+    ports:
+      - "8191:8191"
+
+  app:
+    build: .
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    environment:
+      DATABASE_URL: postgres://goyomi:goyomi@postgres:5432/goyomi?sslmode=disable
+      FLARESOLVERR_URL: http://flaresolverr:8191
+    depends_on:
+      postgres:
+        condition: service_healthy
+      flaresolverr:
+        condition: service_started
+
+volumes:
+  postgres_data: