new: replace in-memory record repository with JSON-backed implementation

.gitignore

@@ -25,6 +25,9 @@ node_modules/
 # Firebase config (App Distribution) — per-developer, not tracked (see google-services.example.json)
 androidApp/google-services.json
 
+# Records data — course content kept out of Version Control (see records.example.json for the schema).
+data/resources/src/commonMain/composeResources/files/records.json
+
 # Android signing — must NOT be checked into Version Control
 keystore.properties
 *.jks