refactor(api): split monolithic handlers.go into focused modules

Break down the 627-line handlers.go into specialized modules:
- handlers_chat.go: chat and streaming endpoints
- handlers_config.go: configuration endpoints
- handlers_common.go: shared utilities
- handlers_info.go: info and status endpoints
- handlers_terminal.go: terminal/shell endpoints
- handlers_tools.go: tool-related endpoints

Also includes config improvements, orchestrator enhancements, and
web component updates.

💘 Generated with Crush

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

internal/orchestrator/orchestrator_test.go

@@ -1,6 +1,9 @@
 package orchestrator
 
 import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
 	"strings"
 	"testing"
 
@@ -14,7 +17,7 @@ func TestCleanAIResponse(t *testing.T) {
 		expected string
 	}{
 		{
-			"removes standard think tags",
+			"malformed think tags pass through",
 			"<think internal reasoning</think Hello world",
 			"<think internal reasoning</think Hello world",
 		},
@@ -24,7 +27,7 @@ func TestCleanAIResponse(t *testing.T) {
 			"response",
 		},
 		{
-			"removes think with attrs",
+			"think with attrs, no closing bracket",
 			"<think type=re>reasoning</think result",
 			"<think type=re>reasoning</think result",
 		},
@@ -49,12 +52,12 @@ func TestCleanAIResponse(t *testing.T) {
 			"",
 		},
 		{
-			"removes valid think block",
+			"malformed think block no closing bracket",
 			"<think some reasoning here</think rest",
 			"<think some reasoning here</think rest",
 		},
 		{
-			"removes simple think",
+			"malformed simple think no closing bracket",
 			"before<think reasoning</think after",
 			"before<think reasoning</think after",
 		},
@@ -146,3 +149,128 @@ func TestNewNoAPIKey(t *testing.T) {
 		t.Error("Should fail with no API key")
 	}
 }
+
+func TestSendStreamChunks(t *testing.T) {
+	sseBody := `data: {"choices":[{"delta":{"content":"Hello"}}]}
+data: {"choices":[{"delta":{"content":" world"}}]}
+data: {"choices":[{"delta":{"content":"!"}}]}
+data: [DONE]
+`
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Authorization") != "Bearer test-key" {
+			http.Error(w, "unauthorized", http.StatusUnauthorized)
+			return
+		}
+		var reqBody ChatRequest
+		if err := json.NewDecoder(r.Body).Decode(&reqBody); err != nil {
+			http.Error(w, "bad request", http.StatusBadRequest)
+			return
+		}
+		if !reqBody.Stream {
+			http.Error(w, "stream must be true", http.StatusBadRequest)
+			return
+		}
+		w.Header().Set("Content-Type", "text/event-stream")
+		w.Write([]byte(sseBody))
+	}))
+	defer ts.Close()
+
+	cfg := config.Default()
+	cfg.AI.Providers[0].Active = true
+	cfg.AI.Providers[0].APIKey = "test-key"
+	cfg.AI.Providers[0].BaseURL = ts.URL
+
+	orb, err := New(cfg)
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+
+	var chunks []string
+	result, err := orb.SendStream("hi", func(chunk string) {
+		chunks = append(chunks, chunk)
+	})
+	if err != nil {
+		t.Fatalf("SendStream: %v", err)
+	}
+	if result != "Hello world!" {
+		t.Errorf("SendStream result = %q, want %q", result, "Hello world!")
+	}
+	if len(chunks) != 3 {
+		t.Fatalf("expected 3 chunks, got %d: %v", len(chunks), chunks)
+	}
+	if strings.Join(chunks, "") != "Hello world!" {
+		t.Errorf("chunks joined = %q, want %q", strings.Join(chunks, ""), "Hello world!")
+	}
+}
+
+func TestSendStreamHistory(t *testing.T) {
+	callCount := 0
+	sseBody := `data: {"choices":[{"delta":{"content":"reply"}}]}
+data: [DONE]
+`
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		callCount++
+		var reqBody ChatRequest
+		if err := json.NewDecoder(r.Body).Decode(&reqBody); err != nil {
+			http.Error(w, "bad request", http.StatusBadRequest)
+			return
+		}
+		if callCount == 1 {
+			if len(reqBody.Messages) != 2 {
+				t.Errorf("first call: expected 2 messages (system + 1 user), got %d", len(reqBody.Messages))
+			}
+		} else {
+			if len(reqBody.Messages) != 4 {
+				t.Errorf("second call: expected 4 messages (system + 3 history), got %d", len(reqBody.Messages))
+			}
+		}
+		w.Header().Set("Content-Type", "text/event-stream")
+		w.Write([]byte(sseBody))
+	}))
+	defer ts.Close()
+
+	cfg := config.Default()
+	cfg.AI.Providers[0].Active = true
+	cfg.AI.Providers[0].APIKey = "test-key"
+	cfg.AI.Providers[0].BaseURL = ts.URL
+
+	orb, err := New(cfg)
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	orb.SetSystemPrompt("you are helpful")
+
+	_, _ = orb.SendStream("first", func(string) {})
+	_, _ = orb.SendStream("second", func(string) {})
+
+	orb.histMu.Lock()
+	if len(orb.history) != 4 {
+		t.Errorf("expected 4 history entries (2 user + 2 assistant), got %d", len(orb.history))
+	}
+	orb.histMu.Unlock()
+}
+
+func TestSendStreamAPIError(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.Error(w, `{"error":"rate limited"}`, http.StatusTooManyRequests)
+	}))
+	defer ts.Close()
+
+	cfg := config.Default()
+	cfg.AI.Providers[0].Active = true
+	cfg.AI.Providers[0].APIKey = "test-key"
+	cfg.AI.Providers[0].BaseURL = ts.URL
+
+	orb, err := New(cfg)
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+
+	_, err = orb.SendStream("hi", func(string) {})
+	if err == nil {
+		t.Error("expected error for non-200 response")
+	}
+	if !strings.Contains(err.Error(), "429") {
+		t.Errorf("error should mention status code, got: %v", err)
+	}
+}