feat(embedding): 嵌入（n-gram 哈希向量 + 关键词 FTS + OpenAI 兼容 API 钩子 + Manager 选择）

internal/runtime/embedding/manager_test.go

@@ -0,0 +1,64 @@
+package embedding
+
+import (
+	"context"
+	"testing"
+
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
+)
+
+func TestManager_SelectsAPIWhenConfigured(t *testing.T) {
+	t.Parallel()
+
+	cfg := config.EmbeddingConfig{
+		APIURL: "http://localhost:9999/v1/embeddings",
+		APIKey: "secret",
+		Model:  "text-embedding-3-small",
+	}
+	m := New(cfg)
+	if m.Embedder() == nil {
+		t.Fatal("Embedder() returned nil")
+	}
+	if _, ok := m.Embedder().(*APIEmbedder); !ok {
+		t.Fatalf("Embedder() = %T, want *APIEmbedder", m.Embedder())
+	}
+}
+
+func TestManager_SelectsNGramByDefault(t *testing.T) {
+	t.Parallel()
+
+	m := New(config.EmbeddingConfig{})
+	emb, ok := m.Embedder().(*NGramEmbedder)
+	if !ok {
+		t.Fatalf("Embedder() = %T, want *NGramEmbedder", m.Embedder())
+	}
+	if emb.Dim() != defaultNGramDim {
+		t.Errorf("default ngram dim = %d, want %d", emb.Dim(), defaultNGramDim)
+	}
+}
+
+func TestManager_BlankAPIURLSelectsNGram(t *testing.T) {
+	t.Parallel()
+
+	cfg := config.EmbeddingConfig{APIURL: "   "} // whitespace counts as unset
+	m := New(cfg)
+	if _, ok := m.Embedder().(*NGramEmbedder); !ok {
+		t.Fatalf("Embedder() = %T, want *NGramEmbedder for blank URL", m.Embedder())
+	}
+}
+
+func TestManager_EmbedDelegatesToSelectedEmbedder(t *testing.T) {
+	t.Parallel()
+
+	m := New(config.EmbeddingConfig{})
+	vectors, err := m.Embed(context.Background(), []string{"hello"})
+	if err != nil {
+		t.Fatalf("Embed() error: %v", err)
+	}
+	if len(vectors) != 1 {
+		t.Fatalf("got %d vectors, want 1", len(vectors))
+	}
+	if len(vectors[0]) != defaultNGramDim {
+		t.Errorf("vector length = %d, want %d", len(vectors[0]), defaultNGramDim)
+	}
+}