refactor(asset-storage): fix security problems

api/agent-notes/controllers/files/__init__.py.md

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+Summary:
+- Registers file-related API namespaces and routes for files service.
+- Includes app-assets download proxy controller.
+
+Invariants:
+- files_ns must include all file controller modules to register routes.
+
+Tests:
+- Coverage via controller unit tests and route registration smoke checks.