Rebuild frontend with Tailwind CSS + fix Python 3.14 compatibility

- Upgrade SQLAlchemy 2.0.27→2.0.45, google-genai SDK for Python 3.14
- Replace google-generativeai with google-genai in narrative_service.py
- Fix HTTPException handling in main.py (was wrapping as 500)
- Rebuild all frontend components with Tailwind CSS v3:
  - Dashboard, NarrativeSection, StatsGrid, VibeRadar, HeatMap, TopRotation
  - Custom color palette (background-dark, card-dark, accent-neon, etc.)
  - Add glass-panel, holographic-badge CSS effects
- Docker improvements:
  - Combined backend container (API + worker in entrypoint.sh)
  - DATABASE_URL configurable via env var
  - CI workflow builds both backend and frontend images
- Update README with clearer docker-compose instructions

frontend/src/index.css

@@ -1,68 +1,88 @@
-:root {
-  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
-  line-height: 1.5;
-  font-weight: 400;
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
 
-  color-scheme: light dark;
-  color: rgba(255, 255, 255, 0.87);
-  background-color: #242424;
-
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
+/* Custom Utilities from code.html */
+.glass-panel {
+    background: rgba(24, 34, 52, 0.6);
+    backdrop-filter: blur(12px);
+    -webkit-backdrop-filter: blur(12px);
+    border: 1px solid rgba(255, 255, 255, 0.08);
 }
 
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
-}
-a:hover {
-  color: #535bf2;
+.holographic-badge {
+    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
+    box-shadow: 0 0 20px rgba(37, 106, 244, 0.3), inset 0 0 0 1px rgba(255, 255, 255, 0.2);
+    backdrop-filter: blur(8px);
+    position: relative;
+    overflow: hidden;
 }
 
-body {
-  margin: 0;
-  display: flex;
-  place-items: center;
-  min-width: 320px;
-  min-height: 100vh;
+.holographic-badge::before {
+    content: "";
+    position: absolute;
+    top: -50%;
+    left: -50%;
+    width: 200%;
+    height: 200%;
+    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
+    transform: rotate(45deg);
+    animation: holo-shine 3s infinite linear;
 }
 
-h1 {
-  font-size: 3.2em;
-  line-height: 1.1;
+@keyframes holo-shine {
+    0% {
+        transform: translateX(-100%) rotate(45deg);
+    }
+    100% {
+        transform: translateX(100%) rotate(45deg);
+    }
 }
 
-button {
-  border-radius: 8px;
-  border: 1px solid transparent;
-  padding: 0.6em 1.2em;
-  font-size: 1em;
-  font-weight: 500;
-  font-family: inherit;
-  background-color: #1a1a1a;
-  cursor: pointer;
-  transition: border-color 0.25s;
-}
-button:hover {
-  border-color: #646cff;
-}
-button:focus,
-button:focus-visible {
-  outline: 4px auto -webkit-focus-ring-color;
+.typing-cursor::after {
+    content: "|";
+    animation: blink 1s step-end infinite;
 }
 
-@media (prefers-color-scheme: light) {
-  :root {
-    color: #213547;
-    background-color: #ffffff;
-  }
-  a:hover {
-    color: #747bff;
-  }
-  button {
-    background-color: #f9f9f9;
-  }
+@keyframes blink {
+    50% {
+        opacity: 0;
+    }
+}
+
+.mood-gradient {
+    background: radial-gradient(circle at 50% 50%, rgba(37, 106, 244, 0.15), transparent 70%), radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1), transparent 50%);
+}
+
+/* Hide scrollbar for carousel */
+.no-scrollbar::-webkit-scrollbar {
+    display: none;
+}
+
+.no-scrollbar {
+    -ms-overflow-style: none;
+    scrollbar-width: none;
+}
+
+.radar-grid circle {
+    fill: none;
+    stroke: #334155;
+    stroke-width: 1;
+}
+
+.radar-grid line {
+    stroke: #334155;
+    stroke-width: 1;
+}
+
+.radar-area {
+    fill: rgba(37, 106, 244, 0.3);
+    stroke: #256af4;
+    stroke-width: 2;
+}
+
+/* Paper texture */
+.paper-texture {
+    background-color: #f0f0f0;
+    background-image: url(https://lh3.googleusercontent.com/aida-public/AB6AXuCxWgGFi3y5uU1Eo5AvX4bBjCZyqH_y2JcjejnbTD6deIOvWk3bplb-Bj1oFuS3P1LlYkmdnJOUkNL9g9L4yQd3Otfcz6qhp7psxQQqPTkZwV4myWl1ZoEp3ZQfBGYSI-nJnwMpWmwB1uO75co2eIFngOJE3Rn6JmLO_nOUKGhsut6iWdt_LKijBTH7SilsOX7HWTXfekHR2CwuUs4LJ6LkTMCVXS3R-aQTNfmsza_6PcRn40PTaBYS90sY9xtDPFcfgS2vzgPmPDZ6);
 }