feat: initial Luma implementation

Full self-hosted photo manager with:
- Ingestion worker (chokidar + sharp + exifr, dHash perceptual hashing)
- SQLite schema with WAL mode (photos, tags, collections, duplicate_pairs)
- Express API with keyset pagination, tag/collection/search/date filters
- React + Vite UI: timeline, lightbox, detail panel, tag/collection editors
- Duplicate detection (Union-Find grouping) with review + dismiss UI
- Map view (Leaflet + OpenStreetMap, marker clustering)
- Docker multi-stage build + Compose with inline env config
- GitHub Actions: CI build check + ghcr.io image publish on main/tags

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

client/src/api/photos.js

@@ -0,0 +1,74 @@
+async function api(path, options) {
+  const res = await fetch(path, options);
+  if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);
+  return res.status === 204 ? null : res.json();
+}
+
+const json = (body) => ({
+  headers: { 'Content-Type': 'application/json' },
+  body: JSON.stringify(body),
+});
+
+// Library
+export function fetchPhotos({ cursor, limit = 100, q, from, to, tagId, collectionId } = {}) {
+  const p = new URLSearchParams({ limit });
+  if (cursor)       p.set('cursor',       cursor);
+  if (q)            p.set('q',            q);
+  if (from)         p.set('from',         from);
+  if (to)           p.set('to',           to);
+  if (tagId)        p.set('tagId',        tagId);
+  if (collectionId) p.set('collectionId', collectionId);
+  return api(`/api/photos?${p}`);
+}
+
+export function fetchPhotoDetail(id) {
+  return api(`/api/photos/${id}`);
+}
+
+export function fetchMapPhotos() {
+  return api('/api/photos/map');
+}
+
+// Tags
+export function addTag(photoId, name) {
+  return api(`/api/photos/${photoId}/tags`, { method: 'POST', ...json({ name }) });
+}
+
+export function removeTag(photoId, tagId) {
+  return api(`/api/photos/${photoId}/tags/${tagId}`, { method: 'DELETE' });
+}
+
+// Collections
+export function fetchCollections() {
+  return api('/api/collections');
+}
+
+export function createCollection(name, description) {
+  return api('/api/collections', { method: 'POST', ...json({ name, description }) });
+}
+
+export function addToCollection(photoId, collectionId) {
+  return api(`/api/photos/${photoId}/collections`, { method: 'POST', ...json({ collectionId }) });
+}
+
+export function removeFromCollection(photoId, collectionId) {
+  return api(`/api/photos/${photoId}/collections/${collectionId}`, { method: 'DELETE' });
+}
+
+// Tags + collections (for filter dropdowns)
+export function fetchTags() {
+  return api('/api/tags');
+}
+
+// Duplicates
+export function fetchDuplicates() {
+  return api('/api/duplicates');
+}
+
+export function scanDuplicates() {
+  return api('/api/dedupe/scan', { method: 'POST' });
+}
+
+export function dismissGroup(photoIds) {
+  return api('/api/duplicates/dismiss', { method: 'POST', ...json({ photoIds }) });
+}