Add templates, tests, and miscellaneous project files

Includes new page templates (fitness-gym, nonprofit, online-course,
photography-studio, real-estate, startup-company, travel-blog,
wedding-invitation) with thumbnail SVGs, test specs, documentation
files, and minor updates to index.html, router.php, and playwright config.

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

tests/media-blocks-simple.spec.js

@@ -0,0 +1,38 @@
+const { test, expect } = require('@playwright/test');
+const { waitForEditor, addBlockById } = require('./helpers');
+
+test('Media category should have 3 blocks: Image, Video, File/PDF', async ({ page }) => {
+    await waitForEditor(page);
+
+    // Verify all 3 media blocks are registered
+    const mediaBlocks = await page.evaluate(() => {
+        const editor = window.editor;
+        const bm = editor.BlockManager;
+        return {
+            image: !!bm.get('image-block'),
+            video: !!bm.get('video-block'),
+            fileEmbed: !!bm.get('file-embed'),
+        };
+    });
+
+    expect(mediaBlocks.image).toBe(true);
+    expect(mediaBlocks.video).toBe(true);
+    expect(mediaBlocks.fileEmbed).toBe(true);
+
+    // Verify they are in the Media category
+    const categories = await page.evaluate(() => {
+        const editor = window.editor;
+        const bm = editor.BlockManager;
+        return ['image-block', 'video-block', 'file-embed'].map(id => {
+            const block = bm.get(id);
+            const cat = block.get('category');
+            return { id, category: typeof cat === 'string' ? cat : (cat && cat.id) };
+        });
+    });
+
+    for (const block of categories) {
+        expect(block.category).toBe('Media');
+    }
+
+    console.log('All 3 Media blocks verified: Image, Video, File/PDF');
+});