chore(tests): reorganize test suite and archive redundant scripts

- Moved legacy/redundant tests to tests/archive/.
- Relocated root-level debug scripts to tests/integration/.
- Updated tests/README.md with final organized inventory.
- Cleaned up root directory from one-off reproduction scripts.

tests/integration/debug_auth_dependency.py

@@ -0,0 +1,24 @@
+import asyncio
+from typing import Optional
+from app.routers.dependencies_v3 import get_account_context_optional
+
+async def debug_auth():
+    print("--- Debugging get_account_context_optional ---")
+    
+    API_KEY = "IDF68Em5X4HTZlswRNgepQ"
+    
+    # Simulate Query Param
+    ctx = get_account_context_optional(
+        x_aether_api_key_query=API_KEY
+    )
+    
+    print(f"Auth Method: {ctx.auth_method}")
+    print(f"Account ID: {ctx.account_id}")
+    
+    if ctx.auth_method == 'guest':
+        print("❌ Result: Guest (Failure)")
+    else:
+        print(f"✅ Result: {ctx.auth_method} (Success)")
+
+if __name__ == "__main__":
+    asyncio.run(debug_auth())