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/repository/generated/image_usage.sql.go

@@ -0,0 +1,58 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+// source: image_usage.sql
+
+package generated
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+const ensureImageStorageUsageRow = `-- name: EnsureImageStorageUsageRow :exec
+INSERT INTO tenant_image_storage_usage (tenant_id, used_bytes)
+VALUES ($1, 0)
+ON CONFLICT (tenant_id) DO NOTHING
+`
+
+func (q *Queries) EnsureImageStorageUsageRow(ctx context.Context, tenantID int64) error {
+	_, err := q.db.Exec(ctx, ensureImageStorageUsageRow, tenantID)
+	return err
+}
+
+const getImageStorageUsage = `-- name: GetImageStorageUsage :one
+SELECT used_bytes, updated_at
+FROM tenant_image_storage_usage
+WHERE tenant_id = $1
+`
+
+type GetImageStorageUsageRow struct {
+	UsedBytes int64              `json:"used_bytes"`
+	UpdatedAt pgtype.Timestamptz `json:"updated_at"`
+}
+
+func (q *Queries) GetImageStorageUsage(ctx context.Context, tenantID int64) (GetImageStorageUsageRow, error) {
+	row := q.db.QueryRow(ctx, getImageStorageUsage, tenantID)
+	var i GetImageStorageUsageRow
+	err := row.Scan(&i.UsedBytes, &i.UpdatedAt)
+	return i, err
+}
+
+const releaseImageStorageQuota = `-- name: ReleaseImageStorageQuota :exec
+UPDATE tenant_image_storage_usage
+SET used_bytes = GREATEST(0, used_bytes - $1),
+    updated_at = NOW()
+WHERE tenant_id = $2
+`
+
+type ReleaseImageStorageQuotaParams struct {
+	ReleaseBytes int64 `json:"release_bytes"`
+	TenantID     int64 `json:"tenant_id"`
+}
+
+func (q *Queries) ReleaseImageStorageQuota(ctx context.Context, arg ReleaseImageStorageQuotaParams) error {
+	_, err := q.db.Exec(ctx, releaseImageStorageQuota, arg.ReleaseBytes, arg.TenantID)
+	return err
+}