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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