增加/context命令、Tab补全与输入历史，命令处理提取到internal/cli

internal/cli/complete_test.go

@@ -0,0 +1,31 @@
+package cli
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestComplete(t *testing.T) {
+	models := []string{"deepseek-v4-flash", "deepseek-v4-pro", "gpt-4o"}
+	cases := []struct {
+		name string
+		line string
+		want []string
+	}{
+		{"空行返回全部命令", "", commands},
+		{"命令前缀", "/us", []string{"/use"}},
+		{"模型补全", "/use deepseek", []string{"deepseek-v4-flash", "deepseek-v4-pro"}},
+		{"模型无匹配", "/use claude", nil},
+		{"think 补全", "/think o", []string{"on", "off"}},
+		{"effort 补全", "/effort h", []string{"high"}},
+		{"未知命令不补全", "/foo a", nil},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			got := Complete(c.line, models)
+			if !reflect.DeepEqual(got, c.want) {
+				t.Errorf("Complete(%q) = %v, want %v", c.line, got, c.want)
+			}
+		})
+	}
+}