fix: parenthesize multiple exceptions in deps.py to fix SyntaxError on Python <= 3.13

[H-XX-D]

Problem

In backend/app/api/deps.py, line 36 catches multiple exceptions without enclosing parentheses:

except InvalidTokenError, ValidationError:

On Python 3 (including Python 3.10, 3.11, 3.12, and 3.13), running python3 -m py_compile backend/app/api/deps.py fails at parse time:

  File "backend/app/api/deps.py", line 36
    except InvalidTokenError, ValidationError:
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: multiple exception types must be parenthesized

Solution

Parenthesize the exception types to except (InvalidTokenError, ValidationError):.

Verification

Verified with python3 -m py_compile backend/app/api/deps.py (exits 0).

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[H-XX-D]

Closing after checking the repository's supported runtime. backend/pyproject.toml already requires >=3.14,<4.0 and sets Ruff's target to py314.

The original except InvalidTokenError, ValidationError: syntax is valid in Python 3.14 under PEP 758, and I confirmed that the unchanged file compiles with CPython 3.14.6. The reported failure occurs on Python 3.13, outside the supported range.

The formatting commit restored the original syntax, so this PR also has no remaining diff. This was a false positive for the project's supported runtime. Sorry for the noise.