fix(server): handle router setup panic and return error

* return error from New function if route registration panics
* add googleDispatch to handle model:action routing

pkg/server/server.go

@@ -18,14 +18,22 @@ import (
 )
 
 // New builds and returns a configured bunrouter.Router.
+// Returns an error if route registration panics (e.g. conflicting routes).
 func New(
 	cfg *config.Config,
 	clients map[string]embedclient.Client,
 	adp adapter.Adapter,
 	reg *metrics.Registry,
 	logger *zap.Logger,
-) *bunrouter.Router {
-	router := bunrouter.New(
+) (router *bunrouter.Router, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			logger.Error("panic during router setup", zap.Any("recover", r))
+			err = fmt.Errorf("router setup panic: %v", r)
+		}
+	}()
+
+	router = bunrouter.New(
 		bunrouter.WithMiddleware(authMiddleware(cfg.Server.APIKeys)),
 		bunrouter.WithMiddleware(traceMiddleware()),
 		bunrouter.WithMiddleware(metricsMiddleware(reg, adp)),
@@ -35,8 +43,10 @@ func New(
 	h := &handler{cfg: cfg, clients: clients, adapter: adp, logger: logger}
 
 	router.POST("/v1/embeddings", h.openAIEmbeddings)
-	router.POST("/v1/models/:model:embedContent", h.googleEmbedContent)
-	router.POST("/v1/models/:model:batchEmbedContents", h.googleBatchEmbedContents)
+	// Google API uses a literal colon as a method separator (e.g. /v1/models/foo:embedContent).
+	// bunrouter can't distinguish two routes with the same :param prefix, so a single wildcard
+	// captures the full "model:action" segment and dispatches internally.
+	router.POST("/v1/models/*modelaction", h.googleDispatch)
 
 	// OpenAPI spec + docs
 	router.GET("/openapi.yaml", spec.SpecHandler())
@@ -59,7 +69,7 @@ func New(
 		}
 	}
 
-	return router
+	return router, nil
 }
 
 // authMiddleware rejects requests without a valid Bearer token when api_keys is configured.