feat: support private git repositories with token auth

- Entity: added gitToken and gitBranch columns to Application
- DTO: added gitToken and gitBranch fields to Create/Update DTOs
- Build pipeline: git-clone init container now injects token into
  HTTPS URL for private repo authentication (GitHub PAT, GitLab token, etc.)
- Build pipeline: supports cloning specific branch (default: main)
- Frontend deploy page: added Access Token (password field) and Branch
  inputs when Git Repository source is selected
- Frontend deploy page: Review step shows branch and token status
- Frontend app detail: shows branch badge and 🔑 Private indicator
  when git credentials are configured
- Works with: GitHub, GitLab, Bitbucket, any HTTPS-based git host

frontend/src/app/dashboard/deploy/page.tsx

@@ -18,6 +18,8 @@ export default function DeployPage() {
     runtime: 'nodejs',
     databaseType: 'none',
     gitUrl: '',
+    gitToken: '',
+    gitBranch: '',
     envVars: {},
     cpuRequest: '100m',
     cpuLimit: '500m',
@@ -207,13 +209,42 @@ export default function DeployPage() {
               </div>
 
               {sourceMethod === 'git' ? (
-                <div>
-                  <input
-                    className="input-field"
-                    placeholder="https://github.com/user/repo.git"
-                    value={form.gitUrl}
-                    onChange={(e) => setForm({ ...form, gitUrl: e.target.value })}
-                  />
+                <div className="space-y-3">
+                  <div>
+                    <label className="block text-xs text-gray-500 mb-1">Repository URL</label>
+                    <input
+                      className="input-field"
+                      placeholder="https://github.com/user/repo.git"
+                      value={form.gitUrl}
+                      onChange={(e) => setForm({ ...form, gitUrl: e.target.value })}
+                    />
+                  </div>
+                  <div>
+                    <label className="block text-xs text-gray-500 mb-1">
+                      Access Token <span className="text-gray-400">(for private repos)</span>
+                    </label>
+                    <input
+                      className="input-field"
+                      type="password"
+                      placeholder="ghp_xxxxxxxxxxxx or glpat-xxxxxxxxxxxx"
+                      value={form.gitToken || ''}
+                      onChange={(e) => setForm({ ...form, gitToken: e.target.value })}
+                    />
+                    <p className="mt-1 text-xs text-gray-400">
+                      GitHub: Personal Access Token · GitLab: Project Access Token · Leave empty for public repos
+                    </p>
+                  </div>
+                  <div>
+                    <label className="block text-xs text-gray-500 mb-1">
+                      Branch <span className="text-gray-400">(default: main)</span>
+                    </label>
+                    <input
+                      className="input-field"
+                      placeholder="main"
+                      value={form.gitBranch || ''}
+                      onChange={(e) => setForm({ ...form, gitBranch: e.target.value })}
+                    />
+                  </div>
                 </div>
               ) : (
                 <div>
@@ -454,6 +485,18 @@ export default function DeployPage() {
                     : form.gitUrl || '—'}
                 </span>
               </div>
+              {sourceMethod === 'git' && form.gitBranch && (
+                <div className="flex justify-between">
+                  <span className="text-sm text-gray-500">Branch</span>
+                  <span className="text-sm font-medium">{form.gitBranch}</span>
+                </div>
+              )}
+              {sourceMethod === 'git' && form.gitToken && (
+                <div className="flex justify-between">
+                  <span className="text-sm text-gray-500">Auth</span>
+                  <span className="text-sm font-medium text-green-600">🔑 Token provided</span>
+                </div>
+              )}
               <div className="flex justify-between">
                 <span className="text-sm text-gray-500">CPU</span>
                 <span className="text-sm font-medium">{form.cpuRequest} / {form.cpuLimit}</span>