Consolidate MangaCircus app, scraper, and Compose baseline

compose.dev.yml

@@ -0,0 +1,15 @@
+# Controlled service reloads preserve checkpoints; public assets update immediately.
+services:
+  reader:
+    volumes:
+      - ./public:/app/public:ro
+      - ./server.js:/app/server.js:ro
+      - ./catalog.js:/app/catalog.js:ro
+      - ./reading-analytics.js:/app/reading-analytics.js:ro
+      - ./library.js:/app/library.js:ro
+  scraper:
+    volumes:
+      - ./scraper:/app/scraper:ro
+  sentinel:
+    volumes:
+      - ./sentinel:/app/sentinel:ro