ci(release): standardize production workflows on main

Route production builds, releases, and changelog generation through `main`, update contribution guidance for main/next branch targets, and cover the branch policy in workflow tests.

.github/workflows/coolify-helper.yml

@@ -2,7 +2,7 @@ name: Coolify Helper Image
 
 on:
   push:
-    branches: [ "v4.x", "main" ]
+    branches: [ "main" ]
     paths:
       - .github/workflows/coolify-helper.yml
       - docker/coolify-helper/Dockerfile

.github/workflows/coolify-realtime.yml

@@ -2,7 +2,7 @@ name: Coolify Realtime
 
 on:
   push:
-    branches: [ "v4.x", "main" ]
+    branches: [ "main" ]
     paths:
       - .github/workflows/coolify-realtime.yml
       - docker/coolify-realtime/**

.github/workflows/coolify-release.yml

@@ -30,9 +30,9 @@ jobs:
       version: ${{ steps.version.outputs.version }}
     steps:
       - name: Reject releases outside the production branch
-        if: ${{ ! contains(fromJSON('["v4.x", "main"]'), github.ref_name) }}
+        if: ${{ github.ref_name != 'main' }}
         run: |
-          echo "Stable releases must run from v4.x or main, not ${{ github.ref_name }}."
+          echo "Stable releases must run from main, not ${{ github.ref_name }}."
           exit 1
 
       - uses: actions/checkout@v5

.github/workflows/coolify-sha-build.yml

@@ -2,7 +2,7 @@ name: Build Coolify (SHA)
 
 on:
   push:
-    branches: ["v4.x", "main"]
+    branches: ["main"]
 
 permissions:
   contents: read

.github/workflows/coolify-staging-build.yml

@@ -3,7 +3,6 @@ name: Staging Build
 on:
   push:
     branches-ignore:
-      - v4.x
       - main
       - v3.x
       - '**v5.x**'

.github/workflows/generate-changelog.yml

@@ -2,7 +2,7 @@ name: Generate Changelog
 
 on:
   push:
-    branches: [ v4.x, main ]
+    branches: [ main ]
     paths-ignore:
       - .github/workflows/coolify-helper.yml
       - .github/workflows/coolify-helper-next.yml