fix(platform): 公开既有账号文件容量上限 (#684)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

backend/internal/platform/runtime_limits_storage_test.go

@@ -0,0 +1,55 @@
+package platform
+
+import (
+	"encoding/json"
+	"testing"
+
+	"infinite-canvas/backend/internal/model"
+	"infinite-canvas/backend/internal/repository"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestPublicRuntimeLimitsStoredFileGB(t *testing.T) {
+	for _, configured := range []bool{false, true} {
+		db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+		if err != nil {
+			t.Fatal(err)
+		}
+		sqlDB, err := db.DB()
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Cleanup(func() { _ = sqlDB.Close() })
+		if err := db.AutoMigrate(&model.SystemSetting{}); err != nil {
+			t.Fatal(err)
+		}
+		policy := DefaultRuntimePolicy()
+		if configured {
+			policy.Resource.StoredFileGB = 37
+			data, err := json.Marshal(policy)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if err := db.Create(&model.SystemSetting{Key: runtimePolicySettingKey, ValueJSON: string(data)}).Error; err != nil {
+				t.Fatal(err)
+			}
+		}
+		limits, err := New(repository.New(db), nil, nil).PublicRuntimeLimits()
+		if err != nil {
+			t.Fatal(err)
+		}
+		data, err := json.Marshal(limits)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var fields map[string]any
+		if err := json.Unmarshal(data, &fields); err != nil {
+			t.Fatal(err)
+		}
+		if got := fields["storedFileGB"]; got != float64(policy.Resource.StoredFileGB) {
+			t.Errorf("configured=%v: storedFileGB = %v, want %d; JSON=%s", configured, got, policy.Resource.StoredFileGB, data)
+		}
+	}
+}

backend/internal/platform/runtime_policy.go

@@ -137,6 +137,7 @@ type PublicRuntimePolicySetting struct {
 type PublicRuntimeLimits struct {
 	ActiveTaskLimit         int   `json:"activeTaskLimit"`
 	ResourceUploadMB        int64 `json:"resourceUploadMB"`
+	StoredFileGB            int64 `json:"storedFileGB"`
 	RecycleBinRetentionDays int   `json:"recycleBinRetentionDays"`
 }
 
@@ -274,6 +275,7 @@ func (s *Service) PublicRuntimeLimits() (*PublicRuntimeLimits, error) {
 	}
 	return &PublicRuntimeLimits{
 		ActiveTaskLimit: policy.Task.ActiveTaskLimit, ResourceUploadMB: policy.Resource.ResourceUploadMB,
+		StoredFileGB:            policy.Resource.StoredFileGB,
 		RecycleBinRetentionDays: policy.Resource.RecycleBinRetentionDays,
 	}, nil
 }

web/src/services/api/auth.ts

@@ -48,6 +48,7 @@ export type AuthSessionPayload = {
 export type RuntimeLimits = {
     activeTaskLimit: number;
     resourceUploadMB: number;
+    storedFileGB: number;
     recycleBinRetentionDays?: number;
 };