feat(v5.2.0): Improve release notes and installation scripts

**Main Changes**:
1. release.yml: Extract version release notes from CHANGELOG.md
2. install.bat: codex-wrapper → codeagent-wrapper
3. README.md: Update multi-backend architecture description
4. README_CN.md: Sync Chinese description
5. CHANGELOG.md: Complete v5.2.0 release notes in English

Generated with swe-agent-bot

Co-Authored-By: swe-agent-bot <agent@swe-agent.ai>

.github/workflows/release.yml

@@ -104,10 +104,38 @@ jobs:
           cp install.sh install.bat release/
           ls -la release/
 
+      - name: Extract release notes from CHANGELOG
+        id: extract_notes
+        run: |
+          VERSION=${GITHUB_REF#refs/tags/v}
+
+          # Extract version section from CHANGELOG.md
+          awk -v ver="$VERSION" '
+            /^## [0-9]+\.[0-9]+\.[0-9]+ - / {
+              if (found) exit
+              if ($2 == ver) {
+                found = 1
+                next
+              }
+            }
+            found && /^## / { exit }
+            found { print }
+          ' CHANGELOG.md > release_notes.md
+
+          # Fallback to auto-generated if extraction failed
+          if [ ! -s release_notes.md ]; then
+            echo "⚠️ No release notes found in CHANGELOG.md for version $VERSION" > release_notes.md
+            echo "" >> release_notes.md
+            echo "## What's Changed" >> release_notes.md
+            echo "See commits in this release for details." >> release_notes.md
+          fi
+
+          cat release_notes.md
+
       - name: Create Release
         uses: softprops/action-gh-release@v2
         with:
           files: release/*
-          generate_release_notes: true
+          body_path: release_notes.md
           draft: false
           prerelease: false