fix(jsonl): define module logger after imports to satisfy E402

[dripsmvcp]

#361 (RPC traceback-leak fix) inserted _log = logging.getLogger("vouch.jsonl_server") between two import groups in src/vouch/jsonl_server.py. a module-level statement in the middle of the imports trips ruff's E402 (module import not at top of file) on every import that follows it — six of them — so ruff check src tests, the lint step in ci, now fails on the whole test branch. any pr opened or re-run after #361 landed goes red on lint through no fault of its own.

this moves the logger definition to just below the import block, exactly where storage.py already keeps its own module logger (_log = logging.getLogger("vouch.storage")). no behaviour change — same logger, same name, defined a few lines lower.

Test Plan

• ruff check src tests → All checks passed! (was: 6 × E402)
• pytest tests/test_jsonl_server.py green
• mypy src clean

before (on current test):

E402 Module level import not at top of file
  --> src/vouch/jsonl_server.py:45:1
...
Found 6 errors.

after: clean.

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