feat: add image management functionality

- Implemented image folder repository with CRUD operations.
- Added image reference repository for managing image references to articles.
- Created image repository for handling image assets, including listing, inserting, updating, and deleting images.
- Introduced image usage repository to track storage usage and quotas for tenants.
- Added SQL queries for image assets, folders, references, and usage.
- Developed image handler for HTTP endpoints to manage images and folders.
- Created database migration scripts for image-related tables and structures.

server/internal/tenant/app/publish_platforms.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"encoding/json"
+	"strconv"
 	"strings"
 )
 
@@ -86,6 +87,14 @@ func resolveArticleCoverAssetURL(wizardStateJSON []byte) *string {
 	return &value
 }
 
+func resolveArticleCoverImageAssetID(wizardStateJSON []byte) *int64 {
+	value, ok := extractInt64FromJSONPayload(wizardStateJSON, "cover_image_asset_id")
+	if !ok || value <= 0 {
+		return nil
+	}
+	return &value
+}
+
 func extractStringFromJSONPayload(raw []byte, key string) string {
 	if len(raw) == 0 {
 		return ""
@@ -103,6 +112,40 @@ func extractStringFromJSONPayload(raw []byte, key string) string {
 	return strings.TrimSpace(value)
 }
 
+func extractInt64FromJSONPayload(raw []byte, key string) (int64, bool) {
+	if len(raw) == 0 {
+		return 0, false
+	}
+
+	var payload map[string]interface{}
+	if err := json.Unmarshal(raw, &payload); err != nil {
+		return 0, false
+	}
+
+	switch value := payload[key].(type) {
+	case nil:
+		return 0, false
+	case float64:
+		return int64(value), true
+	case int64:
+		return value, true
+	case int:
+		return int64(value), true
+	case string:
+		value = strings.TrimSpace(value)
+		if value == "" {
+			return 0, false
+		}
+		parsed, err := strconv.ParseInt(value, 10, 64)
+		if err != nil {
+			return 0, false
+		}
+		return parsed, true
+	default:
+		return 0, false
+	}
+}
+
 func normalizePlatformsFromValue(raw interface{}) []string {
 	switch typed := raw.(type) {
 	case nil:
@@ -126,7 +169,7 @@ func normalizePlatformsFromValue(raw interface{}) []string {
 	}
 }
 
-func mergeArticleWizardState(raw []byte, title string, platforms []string, coverAssetURL *string) ([]byte, error) {
+func mergeArticleWizardState(raw []byte, title string, platforms []string, coverAssetURL *string, coverImageAssetID NullableInt64Input) ([]byte, error) {
 	state := make(map[string]interface{})
 	if len(raw) > 0 {
 		_ = json.Unmarshal(raw, &state)
@@ -157,5 +200,13 @@ func mergeArticleWizardState(raw []byte, title string, platforms []string, cover
 		}
 	}
 
+	if coverImageAssetID.Set {
+		if coverImageAssetID.Value == nil {
+			delete(state, "cover_image_asset_id")
+		} else {
+			state["cover_image_asset_id"] = *coverImageAssetID.Value
+		}
+	}
+
 	return json.Marshal(state)
 }