Consolidate tools into a secure Docker architecture with landing page

- Implement a central reverse proxy (Nginx) with Basic Auth on port 8090.
- Create a unified landing page (dashboard) to access B2B Assistant and Market Intelligence.
- Update frontends with relative API paths and base paths for subdirectory routing (/b2b/, /market/).
- Optimize Docker builds with .dockerignore and a Python-based image for market-backend.
- Enable code sideloading for Python logic via Docker volumes.
- Fix TypeScript errors in general-market-intelligence regarding ImportMeta.

general-market-intelligence/services/geminiService.ts

@@ -6,8 +6,8 @@ import { LeadStatus, AnalysisResult, Competitor, Language, Tier, EmailDraft, Sea
 // URL Konfiguration:
 // Im Production-Build (Docker/Nginx) nutzen wir den relativen Pfad '/api', da Nginx als Reverse Proxy fungiert.
 // Im Development-Modus (lokal) greifen wir direkt auf den Port 3001 zu.
-const API_BASE_URL = import.meta.env.PROD 
-  ? '/api' 
+const API_BASE_URL = (import.meta as any).env.PROD 
+  ? 'api' 
   : `http://${window.location.hostname}:3001/api`; 
 
 // Helper to extract JSON (kann ggf. entfernt werden, wenn das Backend immer sauberes JSON liefert)