agent: 更智能的 LLM provider 调度（byModel 精确路由 + AUTO 优先级链）

吸收 llmsproxy 的调度思想适配 HomeAgent“一源一模型”结构：
- RoutableProvider{Model,Priority} 次级接口（不破坏既有 Provider 实现）
- ProviderManager.OrderedProviders 改为按 (优先级 desc, 可用, 默认优先) 稳定排序，
  AUTO/空模型走该优先级链
- 新增 ProviderManager.ResolveForModel：精确模型名路由到归属源，找不到回落 AUTO 链
- LuaAdaptedProvider 不再无条件覆写 req.Model；显式模型名原样转发
- LLMSource.Priority + core.llm.sources.<name>.priority 配置项
- process.go: 显式模型走 ResolveForModel，AUTO 走 OrderedProviders
- 新增路由单测（优先级排序 + byModel 解析）

验证: go test ./... 27 包 0 失败；Windows 交叉编译通过；部署后服务健康

cmd/homed/main.go

@@ -294,6 +294,7 @@ func main() {
 			MaxTokens:     cfg.LLM.MaxTokens,
 			ContextWindow: src.ContextWindow,
 			MaxConcurrent: src.MaxConcurrent,
+			Priority:      src.Priority,
 		}, luaVM, src.Name, src.Adapter)
 		providerMgr.Register(src.Name, luaProvider)
 		if src.Adapter != "" {

internal/agent/api/provider.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -154,6 +155,14 @@ type Provider interface {
 	MaxContextTokens() int
 }
 
+// RoutableProvider 是支持精确模型路由/AUTO 优先级的 provider。
+// 不与 Provider 强绑定，避免破坏第三方 Provider 实现。
+type RoutableProvider interface {
+	Provider
+	Model() string // 该 provider 提供的模型名（可能为空表示 AUTO）
+	Priority() int // AUTO 跨源选择的优先级，大者优先
+}
+
 // ModelContextWindow 返回模型的最大上下文窗口（token 数）
 // 标称窗口 ≠ 有效窗口：接近满时注意力涣散，调用方应取 70-80% 为目标利用率
 func ModelContextWindow(model string) int {
@@ -202,6 +211,7 @@ type BaseConfig struct {
 	MaxTokens     int     `json:"max_tokens"`
 	ContextWindow int     `json:"context_window"`
 	MaxConcurrent int     `json:"max_concurrent"`
+	Priority      int     `json:"priority"`
 }
 
 // LuaAdaptedProvider 使用 Lua 脚本做请求/响应变换，直接发起 HTTP 调用
@@ -251,10 +261,13 @@ func (p *LuaAdaptedProvider) MaxContextTokens() int {
 }
 
 func (p *LuaAdaptedProvider) Name() string  { return p.name }
+func (p *LuaAdaptedProvider) Model() string { return p.cfg.Model }
+func (p *LuaAdaptedProvider) Priority() int { return p.cfg.Priority }
 
 func (p *LuaAdaptedProvider) Chat(ctx context.Context, req *CompletionRequest) (*CompletionResponse, error) {
+	if p.cfg.Model != "" && (req.Model == "" || req.Model == "AUTO") {
 		req.Model = p.cfg.Model
-
+	}
 	rawReq, _ := json.Marshal(req)
 
 	transformedBody, err := p.vm.CallTransformRequest(p.adapter, string(rawReq))
@@ -489,7 +502,9 @@ func parseOpenAICompatibleStreamChunk(raw []byte) (StreamChunk, bool) {
 }
 
 func (p *LuaAdaptedProvider) ChatStream(ctx context.Context, req *CompletionRequest) (<-chan StreamChunk, error) {
+	if p.cfg.Model != "" && (req.Model == "" || req.Model == "AUTO") {
 		req.Model = p.cfg.Model
+	}
 	req.Stream = true
 	rawReq, _ := json.Marshal(req)
 
@@ -756,20 +771,63 @@ func (m *ProviderManager) IsAvailable(name string) bool {
 func (m *ProviderManager) OrderedProviders() []Provider {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
+	return m.orderedLocked("")
+}
+
+// orderedLocked 返回 provider 候选链。model 为 "" 表示 AUTO：
+// 按 (优先级 desc, 可用性, 默认优先) 稳定排序；model 非空且存在归属源时，
+// 命中的源排在最前（精确模型路由），其余按优先级跟随。
+func (m *ProviderManager) orderedLocked(model string) []Provider {
 	list := make([]Provider, 0, len(m.order))
-	// 把默认 provider 放第一位，其余按注册顺序
-	if def, ok := m.providers[m.default_]; ok {
-		list = append(list, def)
-	}
 	for _, name := range m.order {
-		if name == m.default_ {
+		if p, ok := m.providers[name]; ok && p != nil {
-			continue
-		}
-		if p, ok := m.providers[name]; ok {
 			list = append(list, p)
 		}
 	}
-	return list
+	type pp struct {
+		p       Provider
+		prio    int
+		isDef   bool
+		isMatch bool
+	}
+	items := make([]pp, 0, len(list))
+	lower := strings.ToLower(strings.TrimSpace(model))
+	for _, p := range list {
+		it := pp{p: p, prio: 0, isDef: p.Name() == m.default_}
+		if rp, ok := p.(RoutableProvider); ok {
+			it.prio = rp.Priority()
+			if lower != "" && lower != "auto" {
+				if strings.EqualFold(rp.Model(), model) {
+					it.isMatch = true
+				}
+			}
+		}
+		items = append(items, it)
+	}
+	sort.SliceStable(items, func(i, j int) bool {
+		if items[i].isMatch != items[j].isMatch {
+			return items[i].isMatch
+		}
+		if items[i].prio != items[j].prio {
+			return items[i].prio > items[j].prio
+		}
+		if items[i].isDef != items[j].isDef {
+			return items[i].isDef
+		}
+		return items[i].p.Name() < items[j].p.Name()
+	})
+	out := make([]Provider, len(items))
+	for i := range items {
+		out[i] = items[i].p
+	}
+	return out
+}
+
+// ResolveForModel 按精确模型名路由到归属 provider；找不到则回落到 AUTO 链。
+func (m *ProviderManager) ResolveForModel(model string) []Provider {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return m.orderedLocked(model)
 }
 
 func (m *ProviderManager) ProviderCount() int {

internal/agent/api/router_test.go

@@ -0,0 +1,66 @@
+package api
+
+import (
+	"context"
+	"testing"
+)
+
+// stubRoutableProvider implements both Provider and RoutableProvider.
+type stubRoutableProvider struct {
+	name    string
+	model   string
+	prio    int
+}
+
+func (s *stubRoutableProvider) Name() string          { return s.name }
+func (s *stubRoutableProvider) Model() string         { return s.model }
+func (s *stubRoutableProvider) Priority() int         { return s.prio }
+func (s *stubRoutableProvider) MaxContextTokens() int { return 4096 }
+func (s *stubRoutableProvider) Chat(context.Context, *CompletionRequest) (*CompletionResponse, error) {
+	return &CompletionResponse{Content: s.name}, nil
+}
+func (s *stubRoutableProvider) ChatStream(context.Context, *CompletionRequest) (<-chan StreamChunk, error) {
+	ch := make(chan StreamChunk, 1)
+	ch <- StreamChunk{Done: true}
+	return ch, nil
+}
+
+func TestProviderManagerPriorityOrder(t *testing.T) {
+	m := NewProviderManager()
+	m.Register("low", &stubRoutableProvider{name: "low", prio: 10})
+	m.Register("high", &stubRoutableProvider{name: "high", prio: 90})
+	m.Register("mid", &stubRoutableProvider{name: "mid", prio: 50})
+
+	got := m.OrderedProviders()
+	wantOrder := []string{"high", "mid", "low"}
+	for i, p := range got {
+		if p.Name() != wantOrder[i] {
+			t.Fatalf("order[%d] = %s, want %s (full=%v)", i, p.Name(), wantOrder[i], names(got))
+		}
+	}
+}
+
+func TestProviderManagerResolveForModel(t *testing.T) {
+	m := NewProviderManager()
+	m.Register("a", &stubRoutableProvider{name: "a", model: "gpt-5"})
+	m.Register("b", &stubRoutableProvider{name: "b", model: "deepseek"})
+
+	got := m.ResolveForModel("deepseek")
+	if len(got) == 0 || got[0].Name() != "b" {
+		t.Fatalf("resolve deepseek: got %v", names(got))
+	}
+
+	// 未知模型回落 AUTO 链（仍按优先级）
+	got2 := m.ResolveForModel("unknown")
+	if len(got2) == 0 {
+		t.Fatal("unknown model should fall back to auto chain")
+	}
+}
+
+func names(ps []Provider) []string {
+	out := make([]string, len(ps))
+	for i, p := range ps {
+		out[i] = p.Name()
+	}
+	return out
+}

internal/agent/core/process.go

@@ -70,7 +70,13 @@ func (a *Agent) process(input string, stageCtx *sdk.StageContext) (response stri
 
 		var providers []agentAPI.Provider
 		if a.providerManager != nil {
-			allProviders := a.providerManager.OrderedProviders()
+			// 精确模型名走 byModel 路由；AUTO/空走优先级链
+			var allProviders []agentAPI.Provider
+			if req.Model != "" && !strings.EqualFold(req.Model, "AUTO") {
+				allProviders = a.providerManager.ResolveForModel(req.Model)
+			} else {
+				allProviders = a.providerManager.OrderedProviders()
+			}
 			providers = make([]agentAPI.Provider, 0, len(allProviders))
 			for _, p := range allProviders {
 				if a.providerManager.IsAvailable(p.Name()) {

internal/config/registry.go

@@ -186,6 +186,7 @@ var sourceFieldDefs = []struct {
 	{"adapter", "string", "适配器"},
 	{"adapter_path", "string", "适配器路径"},
 	{"max_concurrent", "int", "并发上限"},
+	{"priority", "int", "AUTO 优先级（大者优先）"},
 }
 
 // registerSourceDefs 注册 core.llm.sources.<name>.* 的 ConfigDef
@@ -816,6 +817,7 @@ func (r *ConfigRegistry) ToConfig() *types.Config {
 			AdapterPath:     read(p+".adapter_path", ""),
 			ContextWindow:   readInt(p+".context_window", 0),
 			MaxConcurrent:   readInt(p+".max_concurrent", 8),
+			Priority:        readInt(p+".priority", 0),
 			ThinkingEnabled: readBool(p+".thinking_enabled", false),
 		})
 	}

internal/sdk/llm_impl.go

@@ -126,6 +126,7 @@ func (l *llmImpl) ReloadFromConfig() error {
 			MaxTokens:     cfg.LLM.MaxTokens,
 			ContextWindow: src.ContextWindow,
 			MaxConcurrent: src.MaxConcurrent,
+			Priority:      src.Priority,
 		}, l.lua, src.Name, src.Adapter)
 		l.mgr.Register(src.Name, provider)
 		if src.Adapter != "" {

pkg/types/types.go

@@ -105,6 +105,7 @@ type LLMSource struct {
 	AdapterPath     string `json:"adapter_path,omitempty"`
 	ContextWindow   int    `json:"context_window,omitempty"`
 	MaxConcurrent   int    `json:"max_concurrent,omitempty"`
+	Priority        int    `json:"priority,omitempty"`
 	ThinkingEnabled bool   `json:"thinking_enabled,omitempty"`
 }