chore: full project audit cleanup, dead code removal, and documentation update

Dead code removed:
- Module.php: remove assignBackupPlan(), getSelfServiceCurrencies() (no callers)
- Cache.php: remove forgetPattern() (no callers, no-op on filesystem)
- module.js: remove vfLoadSelfServiceReport() (no UI trigger)

Stale files removed:
- .releaserc.json (orphaned, conflicts with tag-based workflow)
- .github/workflows/api-sync-check.yml (baseline never populated)
- docs/openapi-baseline.yaml (placeholder stub)
- scripts/generate-endpoint-doc.sh (broken grep patterns)

Security fixes:
- AdminHTML: cast $serverId to (int), cast $serviceId to (int)
- admin.php: add explicit break after every output() call, sanitize error msgs

File hygiene:
- Move modify.sql into modules/servers/VirtFusionDirect/ (matches README docs)
- Fix CHANGELOG.md: remove duplicate 1.0.0 entry, clean up mixed git host URLs

Documentation:
- CLAUDE.md: full rewrite with current architecture, Cache class, development
  rules (try/catch, ownership validation, HTTP methods, caching policy)
- README.md: remove stale IPv4 removal references, add new features (traffic,
  backups, VNC toggle, password reset, OS gallery, copy buttons), add Cache.php
  to file structure, remove "Primary IPv4 Protection" known issue

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/api-sync-check.yml

@@ -1,65 +0,0 @@
-name: VirtFusion API Change Detection
-
-on:
-  schedule:
-    - cron: '0 9 * * 1'  # Monday 9am UTC
-  workflow_dispatch:
-
-jobs:
-  check-api:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-      issues: write
-      pull-requests: write
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Download current API spec
-        run: curl -sSL -o /tmp/openapi-current.yaml https://docs.virtfusion.com/api/openapi.yaml
-
-      - name: Compare with baseline
-        id: diff
-        run: |
-          if [ ! -f docs/openapi-baseline.yaml ]; then
-            echo "No baseline found — creating initial baseline"
-            cp /tmp/openapi-current.yaml docs/openapi-baseline.yaml
-            echo "changed=initial" >> "$GITHUB_OUTPUT"
-          elif ! diff -q docs/openapi-baseline.yaml /tmp/openapi-current.yaml > /dev/null 2>&1; then
-            echo "API spec has changed"
-            diff docs/openapi-baseline.yaml /tmp/openapi-current.yaml > /tmp/api-diff.txt || true
-            echo "changed=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "No changes detected"
-            echo "changed=false" >> "$GITHUB_OUTPUT"
-          fi
-
-      - name: Create issue on change
-        if: steps.diff.outputs.changed == 'true'
-        uses: actions/github-script@v7
-        with:
-          script: |
-            const fs = require('fs');
-            const diff = fs.readFileSync('/tmp/api-diff.txt', 'utf8').substring(0, 60000);
-            await github.rest.issues.create({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              title: `VirtFusion API spec changed (${new Date().toISOString().split('T')[0]})`,
-              body: `The VirtFusion OpenAPI spec has been updated.\n\n<details><summary>Diff</summary>\n\n\`\`\`diff\n${diff}\n\`\`\`\n</details>\n\nReview the changes and update the module if needed.`,
-              labels: ['api-sync']
-            });
-
-      - name: Update baseline and create PR
-        if: steps.diff.outputs.changed == 'true' || steps.diff.outputs.changed == 'initial'
-        run: |
-          cp /tmp/openapi-current.yaml docs/openapi-baseline.yaml
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          BRANCH="api-sync/$(date +%Y-%m-%d)"
-          git checkout -b "$BRANCH"
-          git add docs/openapi-baseline.yaml
-          git commit -m "chore: update VirtFusion API baseline spec"
-          git push origin "$BRANCH"
-          gh pr create --title "chore: update VirtFusion API baseline" --body "Automated update of the VirtFusion OpenAPI baseline spec." --base main
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}