fix(ai): 遷移 Ollama embedding 至 api embed

tests/test_ollama_embedding.py

@@ -0,0 +1,52 @@
+from services.ollama_service import OllamaService
+
+
+class FakeResponse:
+    def __init__(self, status_code, payload=None, text=""):
+        self.status_code = status_code
+        self._payload = payload or {}
+        self.text = text
+
+    def json(self):
+        return self._payload
+
+
+def test_generate_embedding_uses_current_embed_endpoint(monkeypatch):
+    calls = []
+
+    def fake_post(url, json, timeout):
+        calls.append((url, json, timeout))
+        return FakeResponse(200, {"embeddings": [[0.1, 0.2, 0.3]]})
+
+    monkeypatch.setattr("services.ollama_service.requests.post", fake_post)
+
+    vec = OllamaService().generate_embedding("hello", model="bge-m3:latest", host="http://ollama", timeout=7)
+
+    assert vec == [0.1, 0.2, 0.3]
+    assert calls == [
+        ("http://ollama/api/embed", {"model": "bge-m3:latest", "input": "hello"}, 7),
+    ]
+
+
+def test_generate_embedding_falls_back_to_legacy_embeddings_endpoint(monkeypatch):
+    calls = []
+
+    def fake_post(url, json, timeout):
+        calls.append((url, json, timeout))
+        if url.endswith("/api/embed"):
+            return FakeResponse(404, text="not found")
+        return FakeResponse(200, {"embedding": [0.4, 0.5]})
+
+    monkeypatch.setattr("services.ollama_service.requests.post", fake_post)
+
+    vec = OllamaService().generate_embedding("hello", model="bge-m3:latest", host="http://ollama/", timeout=9)
+
+    assert vec == [0.4, 0.5]
+    assert calls == [
+        ("http://ollama/api/embed", {"model": "bge-m3:latest", "input": "hello"}, 9),
+        ("http://ollama/api/embeddings", {"model": "bge-m3:latest", "prompt": "hello"}, 9),
+    ]
+
+
+def test_extract_embedding_accepts_flat_embeddings_shape():
+    assert OllamaService._extract_embedding({"embeddings": [0.1, 0.2]}) == [0.1, 0.2]