Fix: Improve report-demo route with better path resolution and error handling

chatkit/backend/app/main.py

@@ -259,14 +259,32 @@ async def serve_report_template():
 @app.get("/report-demo")
 async def serve_report_demo():
     """Serve the HTML report template demo."""
-    if REPORT_TEMPLATE_PATH and REPORT_TEMPLATE_PATH.exists():
-        return FileResponse(
-            REPORT_TEMPLATE_PATH,
-            media_type="text/html",
-            headers={"Cache-Control": "public, max-age=3600"}
-        )
+    # Try multiple possible locations (in order of preference)
+    base_dir = Path(__file__).parent.parent  # /home/user/app in Docker
+    possible_paths = [
+        base_dir / "report-template.html",  # Docker: /home/user/app/report-template.html
+        REPORT_TEMPLATE_PATH,  # From find_report_template() (fallback)
+        STATIC_DIR / "report-template.html" if STATIC_DIR.exists() else None,  # Static dir
+        Path(__file__).parent.parent.parent / "report-template.html",  # Dev fallback
+    ]
+    
+    # Filter out None values
+    possible_paths = [p for p in possible_paths if p is not None]
+    
+    for template_path in possible_paths:
+        if template_path.exists():
+            return FileResponse(
+                template_path,
+                media_type="text/html",
+                headers={"Cache-Control": "public, max-age=3600"}
+            )
+    
+    # If not found, return helpful error message with debug info
+    current_dir = base_dir
+    files_in_dir = list(current_dir.glob("*")) if current_dir.exists() else []
+    searched_paths = [str(p) for p in possible_paths]
     return Response(
-        content="Report template not found",
+        content=f"Report template not found.\nSearched: {searched_paths}\nCurrent dir: {current_dir}\nFiles in dir: {[str(f) for f in files_in_dir[:10]]}",
         status_code=404,
         media_type="text/plain"
     )
@@ -297,7 +315,7 @@ if STATIC_DIR.exists():
     async def serve_spa_routes(full_path: str):
         """Catch-all route to serve React SPA for client-side routing."""
         # Don't serve SPA for API routes
-        if full_path.startswith(("api/", "auth/", "chatkit")):
+        if full_path.startswith(("api/", "auth/", "chatkit", "report-demo")):
             return Response(status_code=404)
         
         # Check if it's a static file