feat(admin, miniapp): 优化数据库迁移逻辑与小程序图片资源处理

- 为后端Admin新增migration_compat工具，支持离线迁移时的基线资源检查，重构全部alembic迁移脚本适配离线模式，避免重复创建已存在的数据库表和字段
- 完善初始数据库迁移脚本，添加默认部门种子数据，新增ConciergeAdvisor详情字段从JSON到JSONB的类型转换迁移
- 小程序端新增图片资源解析工具resolveNetworkImage，实现本地静态资源到CDN的自动映射，添加图片加载容错降级机制
- 完善HeroSlide类型定义，新增actionLabel字段，优化首页轮播组件的文本渲染与错误处理逻辑
- 新增对应测试用例验证迁移路径正确性与前端数据处理逻辑
- 新增临时 brainstorm UI对比草稿与开发临时状态文件

WonderQ-Admin/alembic/versions/0017_home_content.py

@@ -5,12 +5,15 @@ Revises: 0016_concierge_advisors
 """
 
 from datetime import datetime
+import json
 
 from alembic import context, op
 import sqlalchemy as sa
 from sqlalchemy import inspect
 from sqlalchemy.dialects import postgresql
 
+from app.migration_compat import baseline_column_names, baseline_table_names
+
 
 revision = "0017_home_content"
 down_revision = "0016_concierge_advisors"
@@ -142,6 +145,13 @@ SEED_WILD_ARCHIVES = (
 
 
 def _create_table(table_name: str, columns: list[sa.Column]) -> None:
+    if is_offline_mode():
+        if table_name in baseline_table_names():
+            return
+        op.create_table(table_name, *columns, sa.PrimaryKeyConstraint("id"))
+        op.create_index(f"ix_{table_name}_isActive", table_name, ["isActive"])
+        op.create_index(f"ix_{table_name}_sortOrder", table_name, ["sortOrder"])
+        return
     bind = op.get_bind()
     if table_name in set(inspect(bind).get_table_names()):
         return
@@ -178,6 +188,11 @@ def _seed_table(table_name: str, columns: list[sa.Column], rows: tuple[dict, ...
     column_types = {column.name: column.type for column in columns}
     if is_offline_mode():
         available_columns = set(column_types)
+        if table_name in baseline_table_names():
+            available_columns.update(baseline_column_names(table_name))
+            for name, column_type in OPTIONAL_SEED_COLUMN_TYPES.items():
+                if name in available_columns:
+                    column_types.setdefault(name, column_type)
     else:
         bind = op.get_bind()
         current_columns = inspect(bind).get_columns(table_name)
@@ -200,7 +215,31 @@ def _seed_table(table_name: str, columns: list[sa.Column], rows: tuple[dict, ...
         ],
     )
     timestamp = datetime(2026, 1, 1)
-    op.bulk_insert(table, prepare_seed_rows(rows, seed_column_names, timestamp))
+    seed_rows = prepare_seed_rows(rows, seed_column_names, timestamp)
+    if is_offline_mode():
+        seed_rows = [
+            {
+                **row,
+                **{
+                    name: json.dumps(row[name], ensure_ascii=False)
+                    for name in ("detailParagraphs", "images")
+                    if name in row
+                },
+            }
+            for row in seed_rows
+        ]
+        for name in ("detailParagraphs", "images"):
+            if name in column_types:
+                column_types[name] = sa.Text()
+        table = sa.table(
+            table_name,
+            *[
+                sa.column(name, column_types[name])
+                for name in column_types
+                if name in seed_column_names
+            ],
+        )
+    op.bulk_insert(table, seed_rows)
 
 
 def upgrade() -> None: