Session修改：Mutex死锁修复+AGENTS更新

docs/WEBDAV_CLI_APPROACH.md

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+# WebDAV Implementation - Simplified Approach
+
+**Status:** CLI integration has errors, need simpler approach
+
+## Current Errors
+
+1. WebDAVCommands type not in scope
+2. http_body_util crate missing
+3. http crate missing  
+4. Handler trait bounds not satisfied
+
+## Solution
+
+Use a separate binary for WebDAV server instead of integrating into main CLI.
+
+### Create standalone WebDAV server
+
+```bash
+# Create src/bin/webdav_server.rs
+cargo build --bin webdav_server
+./target/debug/webdav_server --port 8080 --user warren
+```
+
+This approach is:
+- ✅ Simpler (no complex CLI integration)
+- ✅ Faster to test
+- ✅ Easier to debug
+- ✅ Still reusable
+
+### Manual test ready
+
+Once webdav_server binary created, test:
+```bash
+./target/debug/webdav_server --port 8080 --user warren
+
+# macOS Finder mount:
+Finder → Connect to Server → http://localhost:8080/webdav
+```
+
+---
+
+**Decision: Create standalone webdav_server binary instead of CLI integration**
+
+**Time estimate:** 5 minutes
+
+**Do you want me to proceed with standalone binary approach?**