去除上传图片的分辨率与文件大小限制

- app.py: 删除全部 MAX_FILE_BYTES(≤1MB→1006) 与 MIN_SHORT_SIDE/MIN_LONG_SIDE
  (分辨率→1002) 校验及对应常量; 同步清理 File 描述、图片要求说明、
  错误码表(移除1002/1006)与过时示例
- gateway/app.py: 删除注释掉的 1006 大小校验块与描述里的 ≤1MB
- run_worker.sh / hair-worker.service: 删除临时放开限制的环境变量
- tests: 移除已过时的 test_oversize_1006 / test_lowres_1002 及 oversize_file fixture

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_api.py

@@ -52,17 +52,6 @@ def test_param_multiple_provided_1007(client):
     assert r.json()["code"] == 1007
 
 
-def test_oversize_1006(client, oversize_file):
-    files = {"image_file": ("oversize.bin", open(oversize_file, "rb"), "application/octet-stream")}
-    r = client.post(URL, headers=H, files=files)
-    assert r.json()["code"] == 1006
-
-
-def test_lowres_1002(client):
-    r = _post(client, "lowres.png")
-    assert r.json()["code"] == 1002
-
-
 def test_no_face_1001(client):
     r = _post(client, "landscape.jpg")
     assert r.json()["code"] == 1001