feat(ofsted): add Report Card system support alongside legacy OEIF grades

Ofsted replaced single overall grades with Report Cards from Nov 2025.
Both systems are retained during the transition period.

- DB: new framework + 9 RC columns on ofsted_inspections (schema v4)
- Integrator: auto-detect OEIF vs Report Card from CSV column headers;
  parse 5-level RC grades and safeguarding met/not-met
- API: expose all new fields in the ofsted response dict
- Frontend: branch on framework='ReportCard' to show safeguarding badge
  + 8-category grid; fall back to legacy OEIF layout otherwise;
  always show inspection date in both layouts
- CSS: rcGrade1–5 and safeguardingMet/NotMet classes

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

nextjs-app/components/Footer.tsx

@@ -15,8 +15,7 @@ export function Footer() {
           <div className={styles.section}>
             <h3 className={styles.title}>SchoolCompare</h3>
             <p className={styles.description}>
-              Compare primary school KS2 performance across England. Data sourced from UK Government
-              Compare School Performance.
+              Compare primary schools across England.
             </p>
           </div>
 
@@ -24,14 +23,6 @@ export function Footer() {
             <h4 className={styles.sectionTitle}>About</h4>
             <ul className={styles.links}>
               <li>
-                <a
-                  href="https://www.compare-school-performance.service.gov.uk/"
-                  target="_blank"
-                  rel="noopener noreferrer"
-                  className={styles.link}
-                >
-                  Data Source
-                </a>
               </li>
             </ul>
           </div>