fix(translation): remove duplicate limiter import (closes #2898)

[codeboost-tr]

Closes #2898

Summary

Removes the duplicate limiter import in backend/routes/translation.py. The first import (from backend.services.rate_limit_config import limiter) was silently overridden by the second (from backend.limiter import limiter) on the very next line, so the canonical backend.limiter instance is the one actually used at runtime — making the rate_limit_config import dead code.

Changes

• backend/routes/translation.py:15 — Removed from backend.services.rate_limit_config import limiter and the two blank lines that followed it

Why this is safe

• backend.limiter (line 19, now line 16 after removal) is the canonical, app-wide limiter instance used across the codebase
• rate_limit_config.limiter is silently shadowed on the next line, so removing it has zero runtime impact
• No call sites in this file reference the rate_limit_config instance — verified by full-file read

Testing

• python -c "import ast; ast.parse(open('backend/routes/translation.py').read())" → SYNTAX OK
• git diff confirms only the intended import is removed (3 lines deleted total: 1 import + 2 blank)

Risk

Trivial. One-line removal, no behavior change, no test fixtures to update, no call site changes needed.

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