fix(ci): use explicit port 80 for insecure registry

- Remove http:// prefix from docker login (Docker ignores it)
- Add :80 to registry address so Docker uses HTTP
- Remove redundant daemon.json config (configured at daemon level)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitea/workflows/build.yaml

@@ -27,7 +27,7 @@ jobs:
         id: tags
         shell: sh
         run: |
-          REGISTRY="gitea.gitea.svc.cluster.local"
+          REGISTRY="gitea.gitea.svc.cluster.local:80"
           REPO_OWNER="${{ gitea.repository_owner }}"
           REPO_NAME="${{ gitea.repository }}"
 
@@ -57,16 +57,10 @@ jobs:
 
           echo "IMAGE_LATEST=${IMAGE_BASE}:latest" >> $GITHUB_OUTPUT
 
-      - name: Configure Docker for insecure registry
-        shell: sh
-        run: |
-          mkdir -p /etc/docker
-          echo '{"insecure-registries": ["gitea.gitea.svc.cluster.local"]}' > /etc/docker/daemon.json
-
       - name: Login to registry
         shell: sh
         run: |
-          echo "${{ secrets.PERSONAL_TOKEN }}" | docker login http://gitea.gitea.svc.cluster.local:80 -u "${{ gitea.actor }}" --password-stdin
+          echo "${{ secrets.PERSONAL_TOKEN }}" | docker login gitea.gitea.svc.cluster.local:80 -u "${{ gitea.actor }}" --password-stdin
 
       - name: Build and push API image
         shell: sh
@@ -103,7 +97,7 @@ jobs:
         id: tags
         shell: sh
         run: |
-          REGISTRY="gitea.gitea.svc.cluster.local"
+          REGISTRY="gitea.gitea.svc.cluster.local:80"
           REPO_OWNER="${{ gitea.repository_owner }}"
           REPO_NAME="${{ gitea.repository }}"
 
@@ -133,16 +127,10 @@ jobs:
 
           echo "IMAGE_LATEST=${IMAGE_BASE}:frontend-latest" >> $GITHUB_OUTPUT
 
-      - name: Configure Docker for insecure registry
-        shell: sh
-        run: |
-          mkdir -p /etc/docker
-          echo '{"insecure-registries": ["gitea.gitea.svc.cluster.local"]}' > /etc/docker/daemon.json
-
       - name: Login to registry
         shell: sh
         run: |
-          echo "${{ secrets.PERSONAL_TOKEN }}" | docker login http://gitea.gitea.svc.cluster.local:80 -u "${{ gitea.actor }}" --password-stdin
+          echo "${{ secrets.PERSONAL_TOKEN }}" | docker login gitea.gitea.svc.cluster.local:80 -u "${{ gitea.actor }}" --password-stdin
 
       - name: Build and push frontend image
         shell: sh