refactor: rename Planarchy to CapaKraken (branding only)

User-facing rename across 20 files:
- Layout title/meta: "CapaKraken — Resource & Capacity Planning"
- Sidebar logo: "CapaKraken" with "RESOURCE & CAPACITY PLANNING"
- Sign-in page: "CapaKraken Control Center", "Sign in to CapaKraken"
- PWA manifest: name + short_name
- PDF reports: footer text
- Install prompt: "Install CapaKraken"
- AI assistant system prompt
- Webhooks test payload
- Email subject lines
- Tooltips, descriptions, empty states

NOT changed (technical identifiers):
- Package names (@planarchy/*)
- Import paths
- Database names
- Docker container names
- localStorage keys
- Domain URLs
- CLAUDE.md

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/web/src/components/reports/AllocationReport.tsx

@@ -63,7 +63,7 @@ export function AllocationReport({ title, generatedAt, rows }: AllocationReportP
           ))}
         </View>
 
-        <Text style={styles.footer}>plANARCHY · Confidential · {rows.length} allocations</Text>
+        <Text style={styles.footer}>CapaKraken · Confidential · {rows.length} allocations</Text>
       </Page>
     </Document>
   );