Add password reset flow, attendee profile enhancements, and spec

- Add forgot_password and reset_password templates and routes
- Enhance profile.html with photo crop/zoom functionality
- Add attendee type management to edit_attendee.html
- Update templates styling and layout consistency
- Document database schema in SPEC.md
- Add CLAUDE.md project guidance

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

templates/register.html

@@ -63,6 +63,11 @@
                     <textarea id="introduction" name="introduction" rows="3"></textarea>
                 </div>
 
+                <div class="form-group checkbox-group">
+                    <input type="checkbox" id="visible_to_others" name="visible_to_others" value="1" checked>
+                    <label for="visible_to_others">{{ 'visible_to_attendees'|t }}</label>
+                </div>
+
                 <div class="form-group">
                     <label for="password">{{ 'password'|t }}</label>
                     <input type="password" id="password" name="password" required minlength="6">