feat: 统一后端分页查询与前端服务层适配

后端新增通用分页模块，为报销单、员工、预算、agent 资产等
端点统一接入分页参数和游标查询，优化 repository 层分页实
现，前端服务层适配分页响应结构，完善预算图表和全局样式，
优化侧边栏和企业选择器组件，引入 Element Plus 插件注册。

server/src/app/services/agent_assets.py

@@ -37,6 +37,7 @@ from app.services.agent_asset_spreadsheet_helpers import AgentAssetSpreadsheetHe
 from app.services.agent_asset_timeline import AgentAssetTimelineMixin
 from app.services.agent_foundation import AgentFoundationService
 from app.services.audit import AuditLogService
+from app.services.pagination import PageResult
 from app.services.risk_rule_score_backfill import backfill_missing_risk_rule_score
 
 logger = get_logger("app.services.agent_assets")
@@ -75,6 +76,32 @@ class AgentAssetService(
         version_stats = self._collect_version_stats(assets)
         return [self._serialize_list_item(asset, version_stats.get(asset.id)) for asset in assets]
 
+    def list_assets_page(
+        self,
+        *,
+        asset_type: str | None = None,
+        status: str | None = None,
+        domain: str | None = None,
+        keyword: str | None = None,
+        page: int | None,
+        page_size: int | None,
+    ) -> PageResult[AgentAssetListItem]:
+        self._ensure_ready()
+        if asset_type in {None, "", AgentAssetType.RULE.value}:
+            self.sync_platform_risk_rules_from_library()
+        result = self.repository.list_page(
+            asset_type=asset_type,
+            status=status,
+            domain=domain,
+            keyword=keyword,
+            page=page,
+            page_size=page_size,
+        )
+        version_stats = self._collect_version_stats(result.items)
+        return result.map(
+            lambda asset: self._serialize_list_item(asset, version_stats.get(asset.id))
+        )
+
     def get_asset(self, asset_id: str) -> AgentAssetRead | None:
         self._ensure_ready()
         asset = self.repository.get(asset_id)