fix(ci): repair docker build and consolidate CI/release workflows

The pnpm-fetch layer added in #6296 broke the release build: pnpm 11.10.0
applies patchedDependencies during `pnpm fetch`, before node_modules exists,
crashing with ENOENT. Install directly from the full context with the store
cache mounted instead.

Also audit and consolidate the workflows:
- standardize action majors (cache@v6, upload-artifact@v7, github-script@v9)
- provision Node from mise.toml via jdx/mise-action; drop .nvmrc
- rename deployment-docker-image.yml -> deployment-release.yml, reuse the
  shared setup action, and scope GITHUB_TOKEN permissions per job
- extract the duplicated beta/weekly release logic into a reusable
  deployment-release-pr.yml called by thin triggers

.github/workflows/ci.yml

@@ -167,7 +167,7 @@ jobs:
       - name: Cache Playwright browsers
         if: '!env.ACT'
         id: playwright-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.cache/ms-playwright
           key: playwright-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
@@ -185,7 +185,7 @@ jobs:
 
       - name: Upload E2E artifacts
         if: failure() && !env.ACT
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: playwright-report
           path: e2e/test-results/
@@ -317,7 +317,7 @@ jobs:
 
       - name: Delete GHCR package version
         if: '!env.ACT'
-        uses: actions/github-script@v8
+        uses: actions/github-script@v9
         with:
           script: |
             const packageName = "homarr-test";