fix: simplify CI workflows to run directly on runner without nested containers

- Remove container blocks causing Docker-in-Docker permission issues
- Use actions/checkout@v4 instead of manual git cloning
- Use actions/setup-python@v5 and actions/setup-node@v4 for clean environments
- Remove nsenter workarounds and mount complexity
- Fix volume paths to use /volume1/docker/* directly
- Add /volume1/docker/claude-dev to runner valid_volumes config

This eliminates 20+ commits of permission/namespace hacks by letting
workflows run directly in the runner's environment which already has
Docker access and proper volume mounts configured.

.gitea/workflows/test.yml

@@ -15,18 +15,17 @@ jobs:
 
     steps:
       - name: Checkout repository
-        run: |
-          git clone http://gitea:3000/jimmy/nas-tools.git .
-          git checkout ${{ github.sha }}
+        uses: actions/checkout@v4
 
-      - name: Install Python
-        run: |
-          apt-get update && apt-get install -y python3 python3-pip python3-venv
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
 
       - name: Install dependencies
         run: |
           cd dashboard/backend
-          python3 -m venv venv
+          python -m venv venv
           . venv/bin/activate
           pip install -r requirements.txt
           pip install -r requirements-dev.txt
@@ -52,14 +51,12 @@ jobs:
 
     steps:
       - name: Checkout repository
-        run: |
-          git clone http://gitea:3000/jimmy/nas-tools.git .
-          git checkout ${{ github.sha }}
+        uses: actions/checkout@v4
 
-      - name: Install Node.js
-        run: |
-          curl -fsSL https://deb.nodesource.com/setup_20.x | bash -
-          apt-get install -y nodejs
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
 
       - name: Install dependencies
         run: |