feat: add checkboxes and update webhook for business wizard

- Add 3 checkboxes between textareas and submit button:
  - I already have a homepage (bizHasHomepage)
  - I already use ODOO (bizUsesOdoo)
  - I already have a developer for modules (bizHasDeveloper)
- POST to /webhook/report instead of old webhook UUID
- Include checkbox boolean values in request body
- Add .biz-checkbox-group and .biz-checkbox CSS (inline + external)

style.css

@@ -793,6 +793,32 @@ img { max-width: 100%; height: auto; vertical-align: middle; }
 }
 .biz-field textarea::placeholder { color: rgba(255,255,255,0.3); }
 .biz-form .btn-lg { margin-top: 0.5rem; width: 100%; }
+.biz-checkbox-group {
+  display: flex;
+  flex-direction: column;
+  gap: 0.6rem;
+  margin-bottom: 1rem;
+  padding: 0;
+}
+.biz-checkbox {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
+  font-family: Inter, sans-serif;
+  font-size: 0.85rem;
+  color: rgba(255,255,255,0.75);
+  cursor: pointer;
+  user-select: none;
+  transition: color 0.2s;
+}
+.biz-checkbox:hover { color: #fff; }
+.biz-checkbox input[type="checkbox"] {
+  width: 1.05rem;
+  height: 1.05rem;
+  accent-color: var(--brass);
+  cursor: pointer;
+  flex-shrink: 0;
+}
 .biz-success { margin-top: 1.5rem; }
 .biz-success i { font-size: 2.5rem; color: var(--success); margin-bottom: 0.75rem; }
 .biz-success h3 { color: #fff; margin-bottom: 0.5rem; }