feat: smarter fallback — heuristic sufficiency + result merging (v3.1)

feat: dual-model routing + fallback strategy (v3.0)

feat: optional labels, bilingual auto-expansion, language hint (v2.0)

test: add Chinese/English/mixed language unit tests with optimized labels

test: add HF Space URL, support NER_BASE_URL env override

refactor: remove httpx proxy, call GLiNER model directly

fix: add /api/v1 prefix and restore port 4000

test: add concurrent two-request integration test

test: use ~200-char texts in integration test cases

test: print input/output/elapsed time in integration tests

feat: GLiNER NER HTTP API