feat(agent): 检索工具、模型接入与结构化回复

Agent 按组织与知识源范围调用检索工具，密钥加密保存，回复含来源与转人工意图。

backend/app/core/agno_telemetry.py

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+"""
+Copyright 2024-2026 ReplyPier
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+# agno reports every agent run to api.agno.com unless told not to, and it
+# awaits that call inside the run (60s client timeout). When the call is slow
+# the run outlives AGENT_RUN_TIMEOUT and the visitor gets an apology instead of
+# an answer - for a report nobody here reads, sent from every install.
+#
+# Off by default (settings.AGNO_TELEMETRY / AGNO_MONITOR, from the environment
+# or backend/.env). agno reads these variables before each run report, so
+# setting them once per process covers every agent, wherever it is built. With
+# both off, AGNO_API_ENABLED=false also stops agno's other calls to its API
+# (session logging, playground, evals), which ReplyPier never uses.
+#
+# Environment variables rather than Agent(telemetry=False) because agents are
+# built in many places (chat, transfer, tickets, FAQs, summaries, help center)
+# and in separate worker processes - app/__init__.py calls apply() first thing.
+
+import os
+
+from app.core.config import settings
+
+AGNO_SWITCHES = ("AGNO_TELEMETRY", "AGNO_MONITOR")
+AGNO_API_SWITCH = "AGNO_API_ENABLED"
+
+
+def _env_flag(enabled: bool) -> str:
+    return "true" if enabled else "false"
+
+
+def apply() -> None:
+    """Hand agno the configured telemetry and monitoring switches (idempotent)."""
+    for name in AGNO_SWITCHES:
+        os.environ[name] = _env_flag(getattr(settings, name))
+    if not any(getattr(settings, name) for name in AGNO_SWITCHES):
+        os.environ[AGNO_API_SWITCH] = _env_flag(False)