feat: add Gin HTTP API with SSE streaming chat

internal/api/router.go

@@ -0,0 +1,42 @@
+package api
+
+import (
+	"eino-test/config"
+	"eino-test/internal/rag"
+
+	"github.com/cloudwego/eino/adk"
+	"github.com/gin-contrib/cors"
+	"github.com/gin-gonic/gin"
+)
+
+func NewRouter(cfg *config.Config, pipeline *rag.RAGPipeline, supervisor adk.Agent) *gin.Engine {
+	r := gin.Default()
+
+	r.Use(cors.New(cors.Config{
+		AllowOrigins:     []string{"*"},
+		AllowMethods:     []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowHeaders:     []string{"Origin", "Content-Type", "Authorization"},
+		AllowCredentials: true,
+	}))
+
+	chatHandler := NewChatHandler(supervisor)
+	noteHandler := NewNoteHandler(pipeline)
+	indexHandler := NewIndexHandler(pipeline, cfg)
+
+	api := r.Group("/api")
+	{
+		api.POST("/chat", chatHandler.Chat)
+		api.GET("/notes", noteHandler.ListNotes)
+		api.GET("/notes/:id", noteHandler.GetNote)
+		api.POST("/notes", noteHandler.CreateNote)
+		api.DELETE("/notes/:id", noteHandler.DeleteNote)
+		api.POST("/index", indexHandler.RebuildIndex)
+	}
+
+	r.Static("/static", "./web/dist")
+	r.NoRoute(func(c *gin.Context) {
+		c.File("./web/dist/index.html")
+	})
+
+	return r
+}