refactor(backend): update service layers

- services/agent_conversations.py: update agent conversations service
- services/agent_foundation.py: update agent foundation service
- services/orchestrator.py: update orchestrator service
- services/user_agent.py: update user agent service

server/src/app/services/agent_foundation.py

@@ -35,6 +35,38 @@ from app.models.financial_record import (
 
 logger = get_logger("app.services.agent_foundation")
 
+DEMO_EXPENSE_CLAIM_SIGNATURES = {
+    (
+        "EXP-202605-001",
+        "张三",
+        "华南客户拜访差旅报销",
+        "3280.00",
+        "submitted",
+    ),
+    (
+        "EXP-202605-002",
+        "李四",
+        "客户路演餐费",
+        "860.00",
+        "approved",
+    ),
+    (
+        "EXP-202605-003",
+        "王五",
+        "市场活动会务差旅",
+        "3280.00",
+        "review",
+    ),
+}
+DEMO_RECEIVABLE_SIGNATURES = {
+    ("AR-202605-001", "客户A", "50000.00", "partial"),
+    ("AR-202605-002", "客户B", "78000.00", "overdue"),
+}
+DEMO_PAYABLE_SIGNATURES = {
+    ("AP-202605-001", "供应商A", "33000.00", "scheduled"),
+    ("AP-202605-002", "供应商B", "96000.00", "overdue"),
+}
+
 
 def prepare_agent_foundation() -> None:
     settings = get_settings()
@@ -55,7 +87,7 @@ class AgentFoundationService:
         try:
             Base.metadata.create_all(bind=self.db.get_bind())
             self._seed_agent_assets()
-            self._seed_financial_records()
+            self._sync_demo_financial_records()
             self._seed_runs_and_logs()
             self.db.commit()
         except Exception:
@@ -63,6 +95,12 @@ class AgentFoundationService:
             logger.exception("Failed to prepare agent foundation")
             raise
 
+    def _sync_demo_financial_records(self) -> None:
+        if get_settings().seed_demo_financial_records:
+            self._seed_financial_records()
+            return
+        self._purge_demo_financial_records()
+
     def _seed_agent_assets(self) -> None:
         existing_codes = set(self.db.scalars(select(AgentAsset.code)).all())
         if existing_codes:
@@ -568,6 +606,41 @@ class AgentFoundationService:
 
         self.db.add_all([claim_1, claim_2, claim_3, *ar_records, *ap_records])
 
+    def _purge_demo_financial_records(self) -> None:
+        demo_claims = list(self.db.scalars(select(ExpenseClaim)).all())
+        for claim in demo_claims:
+            signature = (
+                str(claim.claim_no or "").strip(),
+                str(claim.employee_name or "").strip(),
+                str(claim.reason or "").strip(),
+                f"{Decimal(claim.amount or 0):.2f}",
+                str(claim.status or "").strip(),
+            )
+            if signature in DEMO_EXPENSE_CLAIM_SIGNATURES:
+                self.db.delete(claim)
+
+        demo_receivables = list(self.db.scalars(select(AccountsReceivableRecord)).all())
+        for record in demo_receivables:
+            signature = (
+                str(record.receivable_no or "").strip(),
+                str(record.customer_name or "").strip(),
+                f"{Decimal(record.amount_outstanding or 0):.2f}",
+                str(record.status or "").strip(),
+            )
+            if signature in DEMO_RECEIVABLE_SIGNATURES:
+                self.db.delete(record)
+
+        demo_payables = list(self.db.scalars(select(AccountsPayableRecord)).all())
+        for record in demo_payables:
+            signature = (
+                str(record.payable_no or "").strip(),
+                str(record.vendor_name or "").strip(),
+                f"{Decimal(record.amount_outstanding or 0):.2f}",
+                str(record.status or "").strip(),
+            )
+            if signature in DEMO_PAYABLE_SIGNATURES:
+                self.db.delete(record)
+
     def _seed_runs_and_logs(self) -> None:
         if self.db.scalar(select(AgentRun.id).limit(1)) is not None:
             return