restructure: flatten workspace nesting, move devcontainer to root

- backend/workspaces/backend/ → backend/
- backend/workspaces/frontend/ → frontend/
- backend/.devcontainer/ + .vscode/ → repo root (where VS Code expects them)
- loose scripts/SQL files → scripts/
- replace nested git repo with single repo at project root
- update docker-compose.yml build context and devcontainer.json path
- add root .gitignore

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/tailwind.config.js

@@ -0,0 +1,25 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ['./src/**/*.{html,js,svelte,ts}'],
+  theme: {
+    extend: {
+      colors: {
+        brand: {
+          navy: '#002850',      // Header & Hero background
+          mint: '#A6DAD8',      // The Comma accent color
+          sand: '#E4E2D7',      // Content background
+          white: '#ffffff',
+        }
+      },
+      fontFamily: {
+        // Montserrat for UI/Headers, Merriweather for Body text (as established previously)
+        sans: ['Montserrat', 'sans-serif'],
+        serif: ['Merriweather', 'serif'],
+      },
+      fontSize: {
+        'huge': '4rem', // For the large stats numbers (e.g., "29", "5000+")
+      }
+    }
+  },
+  plugins: []
+};