feat(config): 实现阶段 2 配置加载 — 应用配置与 Agent 配置加载

internal/config/application.go

@@ -1 +1,75 @@
 package config
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Application 应用配置顶层结构
+type Application struct {
+	App    AppSection    `yaml:"app"`
+	Server ServerSection `yaml:"server"`
+	Agent  AgentSection  `yaml:"agent"`
+	LLM    LLMSection    `yaml:"llm"`
+}
+
+// AppSection 应用基础信息
+type AppSection struct {
+	Name string `yaml:"name"`
+	Env  string `yaml:"env"`
+}
+
+// ServerSection 服务器配置
+type ServerSection struct {
+	Addr string `yaml:"addr"`
+}
+
+// AgentSection Agent 配置路径列表
+type AgentSection struct {
+	ConfigPaths []string `yaml:"config-paths"`
+}
+
+// LLMSection LLM 相关配置
+type LLMSection struct {
+	RequestTimeout string `yaml:"request-timeout"`
+}
+
+const defaultLLMRequestTimeout = 5 * time.Minute
+
+// RequestTimeoutDuration 解析 LLM 请求超时时间
+func (s LLMSection) RequestTimeoutDuration() (time.Duration, error) {
+	if s.RequestTimeout == "" {
+		return defaultLLMRequestTimeout, nil
+	}
+	d, err := time.ParseDuration(s.RequestTimeout)
+	if err != nil {
+		return 0, fmt.Errorf("invalid llm.request-timeout %q: %w", s.RequestTimeout, err)
+	}
+	if d <= 0 {
+		return 0, fmt.Errorf("llm.request-timeout must be positive, got %q", s.RequestTimeout)
+	}
+	return d, nil
+}
+
+// LoadApplication 从指定路径加载应用配置
+func LoadApplication(path string) (Application, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return Application{}, fmt.Errorf("read application config %s: %w", path, err)
+	}
+	var app Application
+	if err := yaml.Unmarshal(data, &app); err != nil {
+		return Application{}, fmt.Errorf("parse application config: %w", err)
+	}
+	// 设置默认值
+	if app.Server.Addr == "" {
+		app.Server.Addr = ":8091"
+	}
+	if app.App.Env == "" {
+		app.App.Env = "local"
+	}
+	return app, nil
+}