chore: migrate to pnpm workspaces monorepo with Turborepo

- Restructure directories: apps/api, apps/admin, apps/website
- Add root pnpm-workspace.yaml, turbo.json, .prettierrc, .gitignore
- Rename packages to @inkreach/api, @inkreach/admin, @inkreach/website
- Add shared packages: packages/tsconfig, packages/shared-types
- Add pnpm.onlyBuiltDependencies for native builds
- Update docs: README.md, structs.md
- All three projects build successfully

apps/admin/src/style.css

@@ -0,0 +1,100 @@
+:root {
+  --brand-color: #ff6800;
+  --brand-color-hover: #ff7d1f;
+  --brand-color-active: #e65a00;
+
+  --sidebar-width: 240px;
+  --sidebar-width-collapsed: 64px;
+  --header-height: 56px;
+
+  font-family:
+    -apple-system,
+    BlinkMacSystemFont,
+    'Segoe UI',
+    Roboto,
+    'Helvetica Neue',
+    Arial,
+    'PingFang SC',
+    'Hiragino Sans GB',
+    'Microsoft YaHei',
+    sans-serif;
+  color: #1f2937;
+  background-color: #f5f7fa;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html,
+body,
+#app {
+  margin: 0;
+  padding: 0;
+  width: 100%;
+  height: 100%;
+}
+
+a {
+  color: inherit;
+  text-decoration: none;
+}
+
+/* Element Plus brand color overrides */
+:root {
+  --el-color-primary: var(--brand-color);
+  --el-color-primary-light-3: #ff8f3d;
+  --el-color-primary-light-5: #ffb073;
+  --el-color-primary-light-7: #ffd1a8;
+  --el-color-primary-light-8: #ffe0c2;
+  --el-color-primary-light-9: #fff0e0;
+  --el-color-primary-dark-2: #e65a00;
+}
+
+/* Brand-colored buttons */
+.el-button--primary {
+  --el-button-bg-color: var(--brand-color);
+  --el-button-border-color: var(--brand-color);
+  --el-button-hover-bg-color: var(--brand-color-hover);
+  --el-button-hover-border-color: var(--brand-color-hover);
+  --el-button-active-bg-color: var(--brand-color-active);
+  --el-button-active-border-color: var(--brand-color-active);
+}
+
+/* Page wrapper helper */
+.page-container {
+  padding: 16px;
+}
+
+.page-card {
+  background: #ffffff;
+  border-radius: 6px;
+  padding: 16px;
+  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
+}
+
+/* Compact filter bar */
+.filter-bar {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: center;
+  margin-bottom: 16px;
+}
+
+.filter-bar .el-input,
+.filter-bar .el-select,
+.filter-bar .el-cascader {
+  width: 200px;
+}
+
+/* Action cell padding */
+.table-actions .el-button + .el-button {
+  margin-left: 8px;
+}
+
+/* Brand-colored dialog titles */
+.brand-title {
+  color: var(--brand-color);
+  font-weight: 600;
+}