Add Profile/Channel entities with CRUD and remove legacy parser builder.

Introduce reusable ParserProfile and ParseChannel, pair jobs with enqueue flatten, Events admin CRUD, and drop inline/legacy parser-builder UI and aliases.

Co-authored-by: Cursor <cursoragent@cursor.com>

contracts/heuristic_profile.py

@@ -56,7 +56,7 @@ class HeuristicProfile(BaseModel):
 
 
 def target_field_specs() -> list[dict[str, str]]:
-    """Fixed target table for parser-builder UI (roadmap: custom tables later)."""
+    """Fixed target table for profile UI (roadmap: custom tables later)."""
     return [
         {"name": "title", "type": "string", "description": "Short event title"},
         {"name": "description", "type": "string", "description": "Event summary / body"},