feat(python): 完成 Python 全量迁移——剩余平台、登录通道与公共层修复

- 新增 5sing/apple/xm/me/qt/lr 平台包与取流实现（含 xm-sign、MissEvan 签名、蜻蜓 HMAC、Apple developer token）
- 新增 wy/kg/tx/lr 登录：扫码、手机号、账密（kg 20028 风控指纹）、cookie 绑定、kg/tx 续期
- request 层：保留多值 Set-Cookie；JSON body 紧凑化（修复 kg 网关验签）；直连不经系统代理（对齐 Node）
- 登录路由统一 Body(embed=True)，修复扫码轮询 422；lifespan 接入登录续期调度
- ruff/format/pyright 全绿；14 平台真实联网与 HTTP 路由验证通过

app/sdk/platforms/apple/music_search.py

@@ -0,0 +1,90 @@
+"""Apple Music 搜索（对应 sdk/apple/musicSearch.ts，上游 apple.go 的 Search / SearchAlbum / SearchPlaylist）。
+
+通道：amp-api /v1/catalog/<storefront>/search（Bearer developer token，见 util.py）
+单次请求上限 25 条，page/limit 用 offset 翻页；响应没有 total，
+因此 total = 已翻过的条数 + 本页条数（下一页是否存在由 next 决定，allPage=页码+1）。
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from app.sdk.common.utils import as_dict, as_list
+from app.sdk.platforms.apple.util import (
+    apple_album_to_playlist,
+    apple_amp_get,
+    apple_playlist_to_playlist,
+    apple_song_from_catalog,
+    get_apple_config,
+)
+
+#: amp-api search 单页硬上限
+SEARCH_PAGE_MAX = 25
+
+
+async def _catalog_search(keyword: str, types: str, page: int, limit: int) -> dict[str, Any]:
+    word = str(keyword or "").strip()
+    p = max(1, int(page or 1))
+    size = min(max(1, int(limit or 20)), 100)
+    if not word:
+        return {"body": None, "page": p, "limit": size}
+    cfg = get_apple_config()
+    body = await apple_amp_get(
+        f"/v1/catalog/{cfg['storefront']}/search",
+        {
+            "term": word,
+            "types": types,
+            "limit": min(size, SEARCH_PAGE_MAX),
+            "offset": (p - 1) * size,
+        },
+    )
+    return {"body": body, "page": p, "limit": size}
+
+
+async def search(keyword: str, page: int = 1, limit: int = 20, retry_num: int = 0) -> dict[str, Any]:
+    del retry_num  # 契约参数，amp-api 无重试语义
+    result = await _catalog_search(keyword, "songs", page, limit)
+    p, size = result["page"], result["limit"]
+    results = as_dict(as_dict(result["body"]).get("results"))
+    bucket = as_dict(results.get("songs"))
+    songs = [apple_song_from_catalog(item) for item in as_list(bucket.get("data"))]
+    has_next = bool(bucket.get("next"))
+    return {
+        "list": songs,
+        "allPage": p + 1 if has_next else p,
+        "total": (p - 1) * size + len(songs),
+        "limit": size,
+        "source": "apple",
+    }
+
+
+async def search_album(keyword: str, page: int = 1, limit: int = 20) -> dict[str, Any]:
+    """上游 SearchAlbum：搜索专辑（返回歌单摘要形状）。"""
+    result = await _catalog_search(keyword, "albums", page, limit)
+    p, size = result["page"], result["limit"]
+    results = as_dict(as_dict(result["body"]).get("results"))
+    items = as_list(as_dict(results.get("albums")).get("data"))
+    songs = [apple_album_to_playlist(item) for item in items]
+    return {
+        "list": songs,
+        "total": (p - 1) * size + len(songs),
+        "page": p,
+        "limit": size,
+        "source": "apple",
+    }
+
+
+async def search_playlist(keyword: str, page: int = 1, limit: int = 20) -> dict[str, Any]:
+    """上游 SearchPlaylist：搜索歌单。"""
+    result = await _catalog_search(keyword, "playlists", page, limit)
+    p, size = result["page"], result["limit"]
+    results = as_dict(as_dict(result["body"]).get("results"))
+    items = as_list(as_dict(results.get("playlists")).get("data"))
+    playlists = [apple_playlist_to_playlist(item) for item in items]
+    return {
+        "list": playlists,
+        "total": (p - 1) * size + len(playlists),
+        "page": p,
+        "limit": size,
+        "source": "apple",
+    }