chore: upgrade StudioBridge v2.1.2 -> v2.1.3, add persistent-folder creation, update runbook

- Rebuild StudioBridge-2.1.3.jar from latest upstream (v2.1.3) and deploy to portable-dist
- Add ensurePersistentDirectories() so the app creates ~/.studio-bridge and Profiles at startup (GUI + --sendonly)
- Bundle full StudioBridge source under StudioBridge-src/ (with rebuild-jar.bat)
- Update launchers (Launch-StudioBridge.bat, portable-dist/StudioBridge.bat) to v2.1.3
- Add check-update.ps1 and UPDATE.md for the step-by-step update runbook
- Update README (v2.1.3, persistent data + updating sections)
- Ignore StudioBridge-src/target/ build output

StudioBridge-src/.github/release.yml

@@ -0,0 +1,29 @@
+changelog:
+  exclude:
+    labels:
+      - duplicate
+      - invalid
+      - wontfix
+      - question
+  categories:
+    - title: "💥 Breaking Changes"
+      labels:
+        - breaking change
+    - title: "✨ New Features & Improvements"
+      labels:
+        - enhancement
+    - title: "🐛 Bug Fixes"
+      labels:
+        - bug
+    - title: "📦 Dependency Updates"
+      labels:
+        - dependencies
+    - title: "🔧 Build & CI"
+      labels:
+        - build
+    - title: "📝 Documentation"
+      labels:
+        - documentation
+    - title: "🔍 Other Changes"
+      labels:
+        - "*"