chore(login): migrate nextjs login to monorepo (#10134)

# Which Problems Are Solved

We move the login code to the zitadel repo.

# How the Problems Are Solved

The login repo is added to ./login as a git subtree pulled from the
dockerize-ci branch.
Apart from the login code, this PR contains the changes from #10116

# Additional Context

- Closes https://github.com/zitadel/typescript/issues/474
- Also merges #10116  
- Merging is blocked by failing check because of:
- https://github.com/zitadel/zitadel/pull/10134#issuecomment-3012086106

---------

Co-authored-by: Max Peintner <peintnerm@gmail.com>
Co-authored-by: Max Peintner <max@caos.ch>
Co-authored-by: Florian Forster <florian@zitadel.com>

.github/workflows/login-quality.yml

@@ -0,0 +1,59 @@
+name: Login Quality
+
+on:
+  workflow_call:
+    inputs:
+      ignore-run-cache:
+        description: 'Ignore run caches'
+        type: boolean
+        required: true
+      node_version:
+        required: true
+        type: string
+jobs:
+  quality:
+    name: Ensure Quality
+    runs-on: depot-ubuntu-22.04-8
+    timeout-minutes: 30
+    permissions:
+      id-token: write
+      actions: write
+    env:
+      CACHE_DIR: /tmp/login-run-caches
+    steps:
+      - uses: actions/checkout@v4
+      - uses: depot/setup-action@v1
+        with:
+          oidc: true
+      - name: Restore Run Caches
+        uses: actions/cache/restore@v4
+        id: run-caches-restore
+        with:
+          path: ${{ env.CACHE_DIR }}
+          key: ${{ runner.os }}-login-run-caches-${{github.ref_name}}-${{ github.sha }}-${{github.run_attempt}}
+          restore-keys: |
+            ${{ runner.os }}-login-run-caches-${{github.ref_name}}-${{ github.sha }}-
+            ${{ runner.os }}-login-run-caches-${{github.ref_name}}-
+            ${{ runner.os }}-login-run-caches-
+      - uses: actions/download-artifact@v4
+        with:
+          path: .artifacts
+          name: zitadel-linux-amd64
+      - name: Unpack executable
+        run: |
+          tar -xvf .artifacts/zitadel-linux-amd64.tar.gz
+          mv zitadel-linux-amd64/zitadel ./zitadel
+      - run: make login_quality
+        env:
+          # latest if branch is main, otherwise image version which is the pull request number
+          LOGIN_BAKE_CLI: depot bake
+          DEPOT_PROJECT_ID: w47wkxzdtw
+          IGNORE_RUN_CACHE: ${{ github.event.inputs.ignore-run-cache }}
+          NODE_VERSION: ${{ inputs.node_version }}
+
+      - name: Save Run Caches
+        uses: actions/cache/save@v4
+        with:
+          path: ${{ env.CACHE_DIR }}
+          key: ${{ steps.run-caches-restore.outputs.cache-primary-key }}
+        if: always()