docs(comments): 注释中文化 · internal/runtime/model + internal/services/backthink（54 文件，纯替换）

- 只翻注释/文档字符串：`go/scanner` 剥注释后按 token 序列+literal 逐 token 比对，**54/54 文件 SAME**；
  改动文件总行数与 HEAD 漂移 = 0（严格 1:1，无合并/拆行）
- 裁决编号与 design 节号逐字保留（03.4.1/03.4.2/03.4.3/14.4.1/14.4.5/07.4.2-4、design/04 §3.1/§3.2 等）；
  `chat_template_kwargs` / `enable_thinking` / `reasoning_effort` / `thinking:{type}` 字段名与形状说明未动
- 存疑译法（已登记）：`persona` 在叙事语境用「角色」、标识符语境保留 `persona`（仓库既有模块本身混用）；
  `rung`→「级」；`provider` 存在「提供商/提供者」两种落笔（可按需一键统一）
- 复核：build/vet 绿 + 两包测试绿；gofmt 干净；残留英文注释 0 条
- 既有存量（未修，只报告）：`model/anthropic_test.go` 612 行 >500；`applyAnthropicEvent` 115 行 >80

internal/services/backthink/state.go

@@ -11,33 +11,33 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
 )
 
-// StateProvider supplies the user's current condition for the interrupt decision
-// (design/12 §2). Production wires IoT/telemetry and calendar; tests inject a
-// mock. It must be concurrency-safe.
+// StateProvider 为打扰决策提供用户当前状况
+// （design/12 §2）。生产接线 IoT/遥测与日历；测试注入
+// mock。它必须并发安全。
 type StateProvider interface {
-	// Current returns the user's current UserState. A nil-able error means "use
-	// a neutral state"; a hard error is logged by the caller and treated as
-	// neutral.
+	// Current 返回用户当前的 UserState。可 nil 的错误表示「用
+	// 中性状态」；硬错误由调用方记日志并按
+	// 中性处理。
 	Current(ctx context.Context) (UserState, error)
 }
 
-// IoTStateProvider is a best-effort StateProvider built over an iot.Manager. It
-// scans the managed devices and reads heart-rate and sleep signals from any
-// device whose id/name/type mentions the corresponding keyword (e.g. "heart",
-// "心率", "sleep", "睡眠"). Work/busy come from a device/state flag; when nothing
-// matches it returns a neutral state rather than an error, so the service still
-// runs without full telemetry wiring.
+// IoTStateProvider 是基于 iot.Manager 的尽力而为 StateProvider。它
+// 扫描纳管设备，并从任何 id/名称/类型提到对应关键词的设备
+// 读取心率与睡眠信号（例如 "heart"、
+// "心率"、"sleep"、"睡眠"）。工作/忙碌来自设备/状态标志；什么都不
+// 匹配时它返回中性状态而不是错误，因此即便没有完整
+// 遥测接线，服务也能运行。
 type IoTStateProvider struct {
 	mgr *iot.Manager
 	log *slog.Logger
 }
 
-// NewIoTStateProvider wraps mgr as a StateProvider.
+// NewIoTStateProvider 把 mgr 包装为 StateProvider。
 func NewIoTStateProvider(mgr *iot.Manager, log *slog.Logger) *IoTStateProvider {
 	return &IoTStateProvider{mgr: mgr, log: logger.WithSource(baseLog(log), "services/backthink")}
 }
 
-// Current implements StateProvider.
+// Current 实现 StateProvider。
 func (p *IoTStateProvider) Current(ctx context.Context) (UserState, error) {
 	if p.mgr == nil {
 		return UserState{}, fmt.Errorf("backthink: state: %w", iot.ErrProviderNotRegistered)
@@ -71,7 +71,7 @@ func (p *IoTStateProvider) Current(ctx context.Context) (UserState, error) {
 	return state, nil
 }
 
-// numState reads the first numeric value among keys from a device's state map.
+// numState 从设备状态 map 中按 keys 读取首个数值。
 func numState(d iot.Device, keys ...string) (int, bool) {
 	for _, k := range keys {
 		v, ok := d.State[k]
@@ -94,13 +94,13 @@ func numState(d iot.Device, keys ...string) (int, bool) {
 	return 0, false
 }
 
-// boolState reads a bool (or a "sleep"/"asleep" string) among keys.
+// boolState 在 keys 中读取一个 bool（或 "sleep"/"asleep" 字符串）。
 func boolState(d iot.Device, keys ...string) bool {
 	b, _ := boolStateOK(d, keys...)
 	return b
 }
 
-// boolStateOK reports whether a bool-typed state flag was found and its value.
+// boolStateOK 报告是否找到了 bool 类型的状态标志及其取值。
 func boolStateOK(d iot.Device, keys ...string) (bool, bool) {
 	for _, k := range keys {
 		v, ok := d.State[k]