chore: convert to Turborepo + npm workspaces monorepo

- Move React/Vite frontend to apps/web/ (@budgetwise/web)
- Add apps/appwrite/ (@budgetwise/appwrite) to source-control the
  Appwrite backend: declarative schema in appwrite.json (5 collections),
  CLI-based deploy.sh for containerized use, functions/ dir for future
  Appwrite Functions
- Add turbo.json for task orchestration (build, deploy, dev)
- Replace .gitlab-ci.yml with Woodpecker CI pipelines in .woodpecker/:
    web-production.yml  — push to main → build + rsync to prod
    web-staging.yml     — push to staging → build + rsync to staging
    web-preview.yml     — PR open → deploy to {pr}.{domain}; PR close → cleanup
    appwrite.yml        — schema changes in apps/appwrite/ → CLI deploy
- All secrets injected via Woodpecker CI (no committed .env files)

apps/web/src/index.css

@@ -0,0 +1,76 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  * {
+    -webkit-tap-highlight-color: transparent;
+    box-sizing: border-box;
+  }
+
+  html {
+    font-family: 'Inter', system-ui, sans-serif;
+    background-color: #0f172a;
+    color: white;
+    overscroll-behavior: none;
+    /* Support for safe areas on modern Android/iOS */
+    padding-top: env(safe-area-inset-top);
+  }
+
+  body {
+    margin: 0;
+    padding: 0;
+    min-height: 100dvh;
+    overflow-x: hidden;
+  }
+
+  /* Scrollbar */
+  ::-webkit-scrollbar {
+    width: 4px;
+  }
+  ::-webkit-scrollbar-track {
+    background: transparent;
+  }
+  ::-webkit-scrollbar-thumb {
+    background: #334155;
+    border-radius: 4px;
+  }
+
+  /* Number inputs – remove spinners */
+  input[type='number']::-webkit-inner-spin-button,
+  input[type='number']::-webkit-outer-spin-button {
+    -webkit-appearance: none;
+    margin: 0;
+  }
+  input[type='number'] {
+    -moz-appearance: textfield;
+  }
+
+  /* Date input dark styling */
+  input[type='date']::-webkit-calendar-picker-indicator {
+    filter: invert(1) opacity(0.5);
+    cursor: pointer;
+  }
+
+  /* Select arrow */
+  select {
+    -webkit-appearance: none;
+    appearance: none;
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
+    background-repeat: no-repeat;
+    background-position: right 12px center;
+    padding-right: 36px !important;
+  }
+}
+
+@layer utilities {
+  /* Bottom safe area for PWA on Android/iOS */
+  .safe-area-bottom {
+    padding-bottom: env(safe-area-inset-bottom, 0px);
+  }
+
+  /* Full viewport height that respects the browser UI on mobile */
+  .h-dvh {
+    height: 100dvh;
+  }
+}