feat(astrolabe): add Nextcloud PHP app for MCP server management

Adds a native Nextcloud app "Astroglobe" that provides:
- Personal settings: OAuth authorization for background MCP access
- Admin settings: Server status and vector sync monitoring
- API endpoints for MCP server communication

The app uses PKCE OAuth flow to obtain tokens for the MCP server,
enabling features like background vector sync per ADR-018.

Includes:
- PHP app structure (controllers, services, settings)
- Vue.js frontend components
- Docker compose mount configuration
- Installation hook for development testing
- ADR-018 documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

third_party/astroglobe/webpack.js

@@ -0,0 +1,27 @@
+const webpackConfig = require('@nextcloud/webpack-vue-config')
+const ESLintPlugin = require('eslint-webpack-plugin')
+const StyleLintPlugin = require('stylelint-webpack-plugin')
+const path = require('path')
+
+webpackConfig.entry = {
+	main: { import: path.join(__dirname, 'src', 'main.js'), filename: 'main.js' },
+}
+
+webpackConfig.plugins.push(
+	new ESLintPlugin({
+		extensions: ['js', 'vue'],
+		files: 'src',
+	}),
+)
+webpackConfig.plugins.push(
+	new StyleLintPlugin({
+		files: 'src/**/*.{css,scss,vue}',
+	}),
+)
+
+webpackConfig.module.rules.push({
+	test: /\.svg$/i,
+	type: 'asset/source',
+})
+
+module.exports = webpackConfig