perf(queue): 按策略动态扩缩异步 Worker

将 River 执行容量按平台模型与用户组的有效并发策略动态调整，并为长任务续租、并发租约原子抢占和限流退避补充保护。\n\n统一平台模型限流继承语义，兼容历史 platformLimits/modelLimits，并为三个迁移图像模型建立独立并发租约。补充管理端显式继承/覆盖配置、指标、单元测试及隔离 PostgreSQL 验收。\n\n验证：go test ./... -count=1；pnpm lint；pnpm test；pnpm build；隔离 PostgreSQL 并发原子性/续租测试；128 任务与三分钟长任务动态 Worker 验收。

apps/api/internal/store/rate_limit_status_test.go

@@ -6,23 +6,23 @@ import (
 )
 
 func TestEffectiveModelRateLimitPolicyTreatsModelRulesAsAuthoritative(t *testing.T) {
-	policy := effectiveModelRateLimitPolicy(
-		map[string]any{"rules": []any{
+	policy := EffectiveRateLimitPolicy(EffectiveRateLimitPolicyInput{
+		PlatformPolicy: map[string]any{"rules": []any{
 			map[string]any{"metric": "rpm", "limit": 500},
 			map[string]any{"metric": "tpm_total", "limit": 100000},
 		}},
-		map[string]any{"rules": []any{
+		RuntimePolicy: map[string]any{"rules": []any{
 			map[string]any{"metric": "rpm", "limit": 120},
 			map[string]any{"metric": "tpm_total", "limit": 240000},
 			map[string]any{"metric": "concurrent", "limit": 6},
 		}},
-		"runtime-policy-1",
-		map[string]any{},
-		map[string]any{"rules": []any{
+		RuntimePolicyExplicit: true,
+		ModelPolicy: map[string]any{"rules": []any{
 			map[string]any{"metric": "rpm", "limit": 30},
 			map[string]any{"metric": "concurrent", "limit": 2},
 		}},
-	)
+		ModelPolicyMode: "override",
+	})
 
 	if got := rateLimitForMetric(policy, "rpm"); got != 30 {
 		t.Fatalf("expected model rpm limit to win, got %v", got)
@@ -36,16 +36,15 @@ func TestEffectiveModelRateLimitPolicyTreatsModelRulesAsAuthoritative(t *testing
 }
 
 func TestEffectiveModelRateLimitPolicyTreatsEmptyRuntimePolicyAsUnlimited(t *testing.T) {
-	policy := effectiveModelRateLimitPolicy(
-		map[string]any{"rules": []any{
+	policy := EffectiveRateLimitPolicy(EffectiveRateLimitPolicyInput{
+		PlatformPolicy: map[string]any{"rules": []any{
 			map[string]any{"metric": "rpm", "limit": 500},
 			map[string]any{"metric": "tpm_total", "limit": 100000},
 		}},
-		map[string]any{"rules": []any{}},
-		"runtime-policy-1",
-		map[string]any{},
-		map[string]any{},
-	)
+		RuntimePolicy:         map[string]any{"rules": []any{}},
+		RuntimePolicyExplicit: true,
+		ModelPolicyMode:       "inherit",
+	})
 
 	if got := rateLimitForMetric(policy, "rpm"); got != 0 {
 		t.Fatalf("expected empty runtime policy rpm to mean unlimited, got %v", got)
@@ -56,17 +55,16 @@ func TestEffectiveModelRateLimitPolicyTreatsEmptyRuntimePolicyAsUnlimited(t *tes
 }
 
 func TestEffectiveModelRateLimitPolicyTreatsNegativeLimitAsUnlimited(t *testing.T) {
-	policy := effectiveModelRateLimitPolicy(
-		map[string]any{"rules": []any{
+	policy := EffectiveRateLimitPolicy(EffectiveRateLimitPolicyInput{
+		PlatformPolicy: map[string]any{"rules": []any{
 			map[string]any{"metric": "rpm", "limit": 500},
 		}},
-		map[string]any{"rules": []any{
+		RuntimePolicy: map[string]any{"rules": []any{
 			map[string]any{"metric": "rpm", "limit": -1},
 		}},
-		"runtime-policy-1",
-		map[string]any{},
-		map[string]any{},
-	)
+		RuntimePolicyExplicit: true,
+		ModelPolicyMode:       "inherit",
+	})
 
 	if got := rateLimitForMetric(policy, "rpm"); got != -1 {
 		t.Fatalf("expected negative runtime rpm marker to be preserved, got %v", got)