refactor: apply Clean Architecture principles

- Extract EXIF and Swipe logic into custom hooks for Lightbox
- Extract Map layout data formatting into mapService
- Extract AlbumDetailView and SubpageGridView components from page router
- Restructure monolithic config.ts into clean config/ directory

lib/config/parser.ts

@@ -0,0 +1,30 @@
+import fs from 'fs';
+import path from 'path';
+import yaml from 'js-yaml';
+
+export function loadYaml<T>(filename: string): T {
+    const yamlPath = path.join(process.cwd(), 'content', filename);
+
+    if (!fs.existsSync(yamlPath)) {
+        if (filename === 'gallery.yaml') {
+            throw new Error(
+                `Required config not found: ${yamlPath}\n` +
+                `Copy content/gallery.yaml.example to content/gallery.yaml and add your album IDs.`,
+            );
+        }
+        return {} as T;
+    }
+
+    const raw = fs.readFileSync(yamlPath, 'utf8');
+    return (yaml.load(raw) || {}) as T;
+}
+
+const UUID_REGEX = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+
+export function validateUuid(id: string, context: string): string {
+    const trimmed = id.trim();
+    if (!UUID_REGEX.test(trimmed)) {
+        throw new Error(`Invalid UUID in ${context}: "${trimmed}"`);
+    }
+    return trimmed;
+}