chore(deps): batch dependency updates, pnpm v11 migration, and fix integration cache

Batch-update dependencies from 17 open renovate PRs:
- @modelcontextprotocol/sdk 1.26→1.29, tiptap 3.25→3.26, ioredis 5.11.0→5.11.1
- mysql2 3.22.4→3.22.5, sql.js ^1.12→^1.14, @types/react 19.2.16→19.2.17
- oxlint ^1.67→^1.68, oxfmt ^0.53→^0.54, concurrently ^9→^10, mantine-contextmenu ^7→^9
- postcss ^8.4→^8.5.10 (security), @fec/remark-a11y-emoji ^3→^4

Migrate docs Tailwind CSS v3 → v4:
- Replace tailwindcss v3 + autoprefixer with tailwindcss v4 + @tailwindcss/postcss
- Convert config from tailwind.config.js to CSS @theme block
- Update PostCSS plugin in docusaurus.config.ts

Upgrade GitHub Actions:
- configure-pages v5→v6, upload-pages-artifact v4→v5, deploy-pages v4→v5
- EndBug/add-and-commit v9→v10, git-auto-commit-action v5→v7

Migrate pnpm v10 → v11 (unblocks #5679):
- Move package.json#pnpm config to pnpm-workspace.yaml
- Convert onlyBuiltDependencies/ignoredBuiltDependencies to allowBuilds map
- Migrate .npmrc settings (nodeLinker, strictPeerDependencies, engineStrict)
- Update packageManager to pnpm@11.5.2

Fix proxmox-api undici type incompatibility:
- Cast fetch parameter to resolve type mismatch between bundled undici versions

Fix integration cache not invalidating after create/update/delete:
- Add utils.integration.all.invalidate() to all mutation onSuccess handlers
- Previously only Next.js server cache was revalidated, not client tRPC cache

apps/docs/docusaurus.config.ts

@@ -285,13 +285,11 @@ const config: Config = {
       };
     },
     "@signalwire/docusaurus-plugin-llms-txt",
-    async function tailwindCssPlugin(context, options) {
+    async function tailwindCssPlugin() {
       return {
         name: "docusaurus-tailwindcss",
         configurePostCss(postcssOptions) {
-          // Appends TailwindCSS and AutoPrefixer.
-          postcssOptions.plugins.push(require("tailwindcss"));
-          postcssOptions.plugins.push(require("autoprefixer"));
+          postcssOptions.plugins.push(require("@tailwindcss/postcss"));
           return postcssOptions;
         },
       };