feat: OpenMesh 基础平台与 MD/PDF 转换技能

- 后端: coworker 智能体框架, WS API, 文件上传, 附件处理
- 前端: Open WebUI, 文件全量走 upload API (含 MD/TXT/JSON 等文本类)
- 技能: md-to-office (pandoc + wkhtmltopdf)
- 修复: 上传文件路径丢失, Agent 搜索浪费, 输出文件跑到 uploads/
- 打包: PyInstaller one-dir, 预打包 pandoc/wkhtmltopdf/chromium

tests/test_anthropic_caching.py

@@ -0,0 +1,87 @@
+"""Prompt-caching breakpoints on the Anthropic provider (OPE-42 follow-up).
+
+The provider opts every request into 5-minute ephemeral caching: one breakpoint on
+the last system block (tools + system) and one on the final message's last content
+block (conversation prefix). Outbound-only — persisted history stays clean.
+"""
+
+from __future__ import annotations
+
+from coworker.providers.anthropic_provider import AnthropicProvider
+
+MARKER = {"type": "ephemeral"}
+
+
+def _kwargs(messages, tools=None):
+    return AnthropicProvider(client=object())._request_kwargs(
+        model="claude-haiku-4-5", messages=messages, tools=tools, settings={}
+    )
+
+
+def test_system_becomes_cached_block_list():
+    kwargs = _kwargs(
+        [
+            {"role": "system", "content": "be terse"},
+            {"role": "user", "content": "hi"},
+        ]
+    )
+    assert kwargs["system"] == [
+        {"type": "text", "text": "be terse", "cache_control": MARKER}
+    ]
+
+
+def test_last_message_last_block_carries_breakpoint():
+    kwargs = _kwargs(
+        [
+            {"role": "user", "content": "first"},
+            {"role": "assistant", "content": "reply"},
+            {"role": "user", "content": "second"},
+        ]
+    )
+    messages = kwargs["messages"]
+    assert messages[-1]["content"][-1]["cache_control"] == MARKER
+    # Only the FINAL message is marked — earlier turns stay unmarked so the
+    # prefix bytes match the previous request's cache.
+    for message in messages[:-1]:
+        assert all("cache_control" not in b for b in message["content"])
+
+
+def test_tool_result_last_block_carries_breakpoint():
+    kwargs = _kwargs(
+        [
+            {"role": "user", "content": "run it"},
+            {
+                "role": "assistant",
+                "content": "",
+                "tool_calls": [
+                    {
+                        "id": "t1",
+                        "type": "function",
+                        "function": {"name": "ls", "arguments": "{}"},
+                    }
+                ],
+            },
+            {"role": "tool", "tool_call_id": "t1", "content": "README.md"},
+        ]
+    )
+    last = kwargs["messages"][-1]["content"][-1]
+    assert last["type"] == "tool_result"
+    assert last["cache_control"] == MARKER
+
+
+def test_persisted_history_is_never_mutated():
+    history = [
+        {"role": "system", "content": "be terse"},
+        {"role": "user", "content": "hi"},
+    ]
+    _kwargs(history)
+    assert history == [
+        {"role": "system", "content": "be terse"},
+        {"role": "user", "content": "hi"},
+    ]
+
+
+def test_no_system_prompt_is_fine():
+    kwargs = _kwargs([{"role": "user", "content": "hi"}])
+    assert "system" not in kwargs
+    assert kwargs["messages"][-1]["content"][-1]["cache_control"] == MARKER