Add animekai source with 1anime direct-MP4 backend (independent CDN)

animekai.be fronted two server backends per episode: megaplay.buzz
(same player/CDN family as hianime — 403s our egress IP) and
my.1anime.site (direct progressive MP4, independent CDN — verified
serving our IP at ~2.4MB/s). This is the rescue path around the
MegaPlay Cloudflare block, per the ani-cli #1945/#1918 work.

- providers/animekai.py: standard interface, per-episode backend
  dispatch (1anime first, then megaplay), same listed-but-dead ->
  raise semantics as hianime. All endpoints ride the shared TTL cache
  (no re-fetching on repeat UI hits).
- upstream.py: megaplay_master() moved out of hianime — the MegaPlay
  chain (embed -> data-id -> getSourcesNew -> enc decrypt -> CDN proof)
  is now shared by every provider fronting that player.
- app.py: /stream forwards Range for progressive files (206 +
  Content-Range passthrough, partial bodies never LRU-cached, 8MB cap
  on the parallel path so a 250MB MP4 can't pin RAM). api_stream
  reports hls=true/false from the URL — the player kind is a property
  of the URL, so future stream types slot in without app changes.
- app.js: hls===false -> native <video> (existing Range-seeking),
  hls.js path untouched.
- run.sh: ANI_SOURCE=animekai,hianime,anidb,anikoto (revert to the old
  chain when the MegaPlay block lifts).
- tests: test_animekai.py (offline: interface, enc decrypt, /stream
  Range via monkeypatched network) + test_animekai_live.py (opt-in
  ANI_LIVE=1 end-to-end, skipped by default so the suite never touches
  animekai.be).

tests/test_animekai.py

@@ -0,0 +1,133 @@
+"""test_animekai.py — animekai provider + MegaPlay decrypt + /stream Range path.
+
+All offline (monkeypatched network) so the suite never touches animekai.be,
+MegaPlay, or any CDN. Live smoke tests live in test_animekai_live.py and
+are skipped unless ANI_LIVE=1.
+
+Run:  .venv/bin/pytest tests/test_animekai.py -q
+"""
+import base64
+import os
+import sys
+import types
+from pathlib import Path
+
+import pytest
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT))
+
+# Live 1anime-style host the /stream allowlist tests will register
+HOST = "my.1anime.site"
+VIDEO = f"https://{HOST}/stream/69f9d2aef757c305714fdc246e06d6bc"
+
+
+def test_animekai_provider_imports():
+    import server.providers.animekai as a  # noqa: F401
+    for fn in ("search", "details", "episodes", "languages", "master_m3u8"):
+        assert callable(getattr(a, fn)), fn
+    assert callable(a.stream_meta)
+    assert callable(a.subtitles)
+
+
+def test_animekai_stream_meta_allowlist():
+    import server.providers.animekai as a
+    assert a.stream_meta("https://other.example/x.m3u8") is None
+    a.STREAM_HOSTS[HOST] = {"Referer": "https://" + HOST + "/"}
+    assert a.stream_meta(VIDEO) == {"Referer": "https://" + HOST + "/"}
+    a.STREAM_HOSTS.clear()
+
+
+# --- MegaPlay payload: old plaintext shape, new AES "enc" shape ------------
+# enc sample: real getSourcesNew response captured 2026-09-29 (deterministic
+# per data-id; key/IV static in the player's public JS — see upstream._MP_KEY)
+ENC = ("wdeBruh3qqn_i5wUNnyaPcXqidp1UWP84FfPHzGyKXA2hDZBfMCmZ4FLvs7_pQuH549Ept"
+       "ax8UOjAJyRIZfrRhUGUKy9OBeGh2yB_-m_JLAlLnWTLzYZC3_C5I4ltveYoiaU66Do9Rg"
+       "I9bCetmk_o87-sd66brXnWV1MbjhLnjw")
+
+
+def test_megaplay_sources_old_shape_passthrough():
+    from server.upstream import megaplay_sources
+    d = {"sources": {"file": "https://cdn.x/master.m3u8"}, "tracks": []}
+    out = megaplay_sources(d)
+    assert out["sources"]["file"] == "https://cdn.x/master.m3u8"
+
+
+def test_megaplay_sources_new_shape_decrypts():
+    from server.upstream import megaplay_sources
+    out = megaplay_sources({"enc": ENC, "tracks": [{"file": "a.vtt"}]})
+    f = out["sources"]["file"]
+    assert f.startswith("https://") and f.endswith("master.m3u8"), f
+    assert out["tracks"] == [{"file": "a.vtt"}]  # outer fields untouched
+
+
+def test_megaplay_sources_no_sources_unchanged():
+    from server.upstream import megaplay_sources
+    assert megaplay_sources({}) == {}
+
+
+def test_megaplay_sources_garbage_enc_raises():
+    from server.upstream import megaplay_sources
+    # corrupt payload must raise (provider -> fallback chain), not return None
+    with pytest.raises(Exception):
+        megaplay_sources({"enc": "AAAA" * 10})
+
+
+# --- /stream Range pass-through (progressive MP4), offline -----------------
+
+class _FakeStream:
+    """Minimal stand-in for a streaming curl_cffi response (206 + chunk)."""
+    status_code = 206
+    headers = {"content-type": "video/mp4",
+               "content-range": f"bytes 0-1023/{1024 * 1024}",
+               "accept-ranges": "bytes"}
+
+    def iter_content(self, chunk_size=1):
+        yield b"x" * 1024
+
+    def close(self):
+        pass
+
+
+@pytest.fixture()
+def app_mod(monkeypatch):
+    monkeypatch.setenv("ANI_SOURCE", "animekai")
+    import server.upstream as up
+    monkeypatch.setattr(up, "get_stream",
+                        lambda url, timeout=12, headers=None: _FakeStream())
+    import server.app as m
+    return m
+
+
+def _drain(it):
+    import asyncio
+    async def _go():
+        return b"".join([c async for c in it])
+    return asyncio.run(_go())
+
+
+def _call(app_mod, token, range_hdr):
+    """Invoke the /stream handler in-process (no TestClient: it wants httpx).
+    Returns (status, headers_dict, body_bytes)."""
+    req = types.SimpleNamespace(headers={"range": range_hdr} if range_hdr else {})
+    resp = app_mod.stream(token, request=req)
+    body = _drain(resp.body_iterator) if getattr(resp, "body_iterator", None) is not None else resp.body
+    return resp.status_code, dict(resp.headers), body
+
+
+def test_stream_range_forwards_206_and_chunk(app_mod):
+    import server.providers.animekai as a
+    a.STREAM_HOSTS[HOST] = {"Referer": "https://" + HOST + "/"}
+    token = base64.urlsafe_b64encode(VIDEO.encode()).decode()
+    status, hdrs, body = _call(app_mod, token, "bytes=0-1023")
+    assert status == 206, status
+    assert hdrs.get("content-range") == f"bytes 0-1023/{1024 * 1024}"
+    assert len(body) == 1024
+
+
+def test_stream_range_not_cached(app_mod):
+    import server.providers.animekai as a
+    a.STREAM_HOSTS[HOST] = {"Referer": "https://" + HOST + "/"}
+    token = base64.urlsafe_b64encode(VIDEO.encode()).decode()
+    _call(app_mod, token, "bytes=0-1023")
+    assert VIDEO not in app_mod._STREAM_CACHE, "ranged chunk poisoned the LRU"