Rewrite from Go + vanilla JS to Python (FastAPI) + React (TypeScript)

- Backend: Python 3.12 with FastAPI, SQLAlchemy, boto3
- Frontend: React 18 with TypeScript, Vite build tooling
- Updated Dockerfile for multi-stage Node + Python build
- Updated CI pipeline for Python backend
- Removed old Go code (cmd/, internal/, go.mod, go.sum)
- Updated README with new tech stack documentation

frontend/src/pages/TreePage.css

@@ -0,0 +1,131 @@
+.breadcrumb {
+  margin-bottom: 1rem;
+  font-size: 0.875rem;
+  color: var(--text-light);
+}
+
+.breadcrumb a {
+  color: var(--primary);
+}
+
+.breadcrumb span {
+  color: var(--text);
+  font-weight: 500;
+}
+
+.description {
+  color: var(--text-light);
+  margin-top: 0.25rem;
+}
+
+.success-message {
+  background-color: #f0fdf4;
+  border: 1px solid #bbf7d0;
+  color: var(--success);
+  padding: 0.75rem 1rem;
+  border-radius: 6px;
+  margin-bottom: 1rem;
+}
+
+.upload-section {
+  margin-bottom: 2rem;
+}
+
+.upload-section h3 {
+  margin-bottom: 1rem;
+  color: var(--primary-dark);
+}
+
+.upload-form {
+  display: flex;
+  gap: 1rem;
+  align-items: flex-end;
+  flex-wrap: wrap;
+}
+
+.upload-form .form-group {
+  margin-bottom: 0;
+  flex: 1;
+  min-width: 200px;
+}
+
+h2 {
+  margin-bottom: 1rem;
+  color: var(--primary-dark);
+}
+
+.grafts-table {
+  background-color: var(--surface);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  overflow: hidden;
+  margin-bottom: 2rem;
+}
+
+.grafts-table table {
+  width: 100%;
+  border-collapse: collapse;
+}
+
+.grafts-table th,
+.grafts-table td {
+  padding: 0.875rem 1rem;
+  text-align: left;
+  border-bottom: 1px solid var(--border);
+}
+
+.grafts-table th {
+  background-color: #f9f9f9;
+  font-weight: 600;
+  font-size: 0.75rem;
+  text-transform: uppercase;
+  color: var(--text-light);
+}
+
+.grafts-table tr:last-child td {
+  border-bottom: none;
+}
+
+.grafts-table tr:hover {
+  background-color: #f9f9f9;
+}
+
+.fruit-id {
+  font-family: monospace;
+  font-size: 0.875rem;
+  color: var(--text-light);
+}
+
+.btn-small {
+  padding: 0.375rem 0.75rem;
+  font-size: 0.75rem;
+}
+
+.usage-section {
+  margin-top: 2rem;
+}
+
+.usage-section h3 {
+  margin-bottom: 0.5rem;
+  color: var(--primary-dark);
+}
+
+.usage-section p {
+  color: var(--text-light);
+  margin-bottom: 0.5rem;
+  font-size: 0.875rem;
+}
+
+.usage-section pre {
+  background-color: #1e1e1e;
+  color: #d4d4d4;
+  padding: 1rem;
+  border-radius: 6px;
+  overflow-x: auto;
+  margin-bottom: 1rem;
+}
+
+.usage-section code {
+  font-family: 'Fira Code', 'Consolas', monospace;
+  font-size: 0.875rem;
+}