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>

packages/api/src/router/assistant.ts

@@ -12,7 +12,7 @@ import { TOOL_DEFINITIONS, executeTool, type ToolContext, type ToolAction } from
 
 const MAX_TOOL_ITERATIONS = 8;
 
-const SYSTEM_PROMPT = `Du bist der plANARCHY-Assistent — ein hilfreicher AI-Assistent für Ressourcenplanung und Projektmanagement in einer 3D-Produktionsumgebung.
+const SYSTEM_PROMPT = `Du bist der CapaKraken-Assistent — ein hilfreicher AI-Assistent für Ressourcenplanung und Projektmanagement in einer 3D-Produktionsumgebung.
 
 Deine Fähigkeiten:
 - Fragen über Ressourcen, Projekte, Allokationen, Budget, Urlaub, Estimates, Org-Struktur, Rollen, Blueprints, Rate Cards beantworten