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/api/v1/endpoints/agent_assets.py

@@ -14,6 +14,7 @@ from app.api.deps import (
     require_rule_editor_user,
     require_rule_reviewer_user,
 )
+from app.api.pagination import PageNumber, PageSize, page_payload, wants_page
 from app.db.session import get_session_factory
 from app.schemas.agent_asset import (
     AgentAssetCreate,
@@ -43,7 +44,7 @@ from app.schemas.agent_asset import (
     AgentAssetVersionRead,
     AgentAssetVersionTimelineItemRead,
 )
-from app.schemas.common import ErrorResponse
+from app.schemas.common import ErrorResponse, PaginatedResponse
 from app.services.agent_assets import AgentAssetService
 from app.services.risk_rule_generation_jobs import RiskRuleGenerationJobService
 
@@ -94,7 +95,7 @@ def _complete_risk_rule_generation_task(
 
 @router.get(
     "",
-    response_model=list[AgentAssetListItem],
+    response_model=list[AgentAssetListItem] | PaginatedResponse[AgentAssetListItem],
     summary="查询 Agent 资产列表",
     description="按资产类型、状态、领域和关键字筛选规则、技能、MCP 与任务资产。",
 )
@@ -116,8 +117,22 @@ def list_agent_assets(
         str | None,
         Query(description="资产编码、名称关键字模糊查询。"),
     ] = None,
-) -> list[AgentAssetListItem]:
-    return AgentAssetService(db).list_assets(
+    page: PageNumber = None,
+    page_size: PageSize = None,
+) -> list[AgentAssetListItem] | PaginatedResponse[AgentAssetListItem]:
+    service = AgentAssetService(db)
+    if wants_page(page, page_size):
+        return page_payload(
+            service.list_assets_page(
+                asset_type=asset_type,
+                status=status_value,
+                domain=domain,
+                keyword=keyword,
+                page=page,
+                page_size=page_size,
+            )
+        )
+    return service.list_assets(
         asset_type=asset_type,
         status=status_value,
         domain=domain,