Consolidate MangaCircus app, scraper, and Compose baseline

.dockerignore

@@ -1,5 +1,29 @@
-data
-library
-.claude
-.git
-node_modules
+# Explicit allowlist; runtime state and credentials never enter image layers.
+**
+!package.json
+!server.js
+!library.js
+!reading-direction.js
+!chapter-identity.js
+!catalog.js
+!reading-analytics.js
+!public/
+!public/**
+!runtime/
+!runtime/**
+!sentinel/
+!sentinel/**
+!scraper/
+!scraper/**
+!tools/
+!tools/**
+scraper/.cache/**
+scraper/logs/**
+scraper/*.manifest.json
+**/*.log
+**/*.tmp
+**/test/**
+**/node_modules/**
+**/.env*
+**/*.pem
+**/*.key