Ensure SQLite DSN treated as base path when attaching schemas

[cobycloud]

Summary

• avoid dangling main SQLite file when AutoAPI bootstraps schema-specific attachments
• test that DSN paths only produce <schema>__<db>.db files

Testing

• uv run --package autoapi --directory standards/autoapi ruff format .
• uv run --package autoapi --directory standards/autoapi ruff check . --fix
• uv run --package autoapi --directory standards/autoapi pytest (fails: tests/i9n/test_core_access.py::test_core_and_core_raw_sync_operations, tests/i9n/test_key_digest_uvicorn.py::test_create_apikey_success, tests/i9n/test_key_digest_uvicorn.py::test_create_response_fields)
• uv run --package autoapi --directory standards/autoapi pytest tests/unit/test_sqlite_attachments.py::test_dsn_treated_as_base_path -q

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https://chatgpt.com/codex/tasks/task_e_68bd0f82b1f083269e37eacdd507ae29