feat(advisor): multi-collection RAG search + country filter (DE/AT/CH/EU)

- Replace single DSFA corpus query with parallel search across 6 collections
  via RAG service (port 8097)
- Add country parameter with metadata filter for bp_compliance_gesetze
- Add country-specific system prompt section
- Add DE/AT/CH/EU toggle buttons in ComplianceAdvisorWidget header

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

admin-compliance/components/sdk/ComplianceAdvisorWidget.tsx

@@ -59,6 +59,15 @@ const EXAMPLE_QUESTIONS: Record<string, string[]> = {
 // COMPONENT
 // =============================================================================
 
+type Country = 'DE' | 'AT' | 'CH' | 'EU'
+
+const COUNTRIES: { code: Country; label: string }[] = [
+  { code: 'DE', label: 'DE' },
+  { code: 'AT', label: 'AT' },
+  { code: 'CH', label: 'CH' },
+  { code: 'EU', label: 'EU' },
+]
+
 export function ComplianceAdvisorWidget({ currentStep = 'default', enableDraftingEngine = false }: ComplianceAdvisorWidgetProps) {
   // Feature-flag: If Drafting Engine enabled, render DraftingEngineWidget instead
   if (enableDraftingEngine) {
@@ -71,6 +80,7 @@ export function ComplianceAdvisorWidget({ currentStep = 'default', enableDraftin
   const [messages, setMessages] = useState<Message[]>([])
   const [inputValue, setInputValue] = useState('')
   const [isTyping, setIsTyping] = useState(false)
+  const [selectedCountry, setSelectedCountry] = useState<Country>('DE')
   const messagesEndRef = useRef<HTMLDivElement>(null)
   const abortControllerRef = useRef<AbortController | null>(null)
 
@@ -124,6 +134,7 @@ export function ComplianceAdvisorWidget({ currentStep = 'default', enableDraftin
             message: content.trim(),
             history,
             currentStep,
+            country: selectedCountry,
           }),
           signal: abortControllerRef.current.signal,
         })
@@ -201,7 +212,7 @@ export function ComplianceAdvisorWidget({ currentStep = 'default', enableDraftin
         setIsTyping(false)
       }
     },
-    [isTyping, messages, currentStep]
+    [isTyping, messages, currentStep, selectedCountry]
   )
 
   // Handle stop generation
@@ -269,7 +280,21 @@ export function ComplianceAdvisorWidget({ currentStep = 'default', enableDraftin
           </div>
           <div>
             <div className="font-semibold text-sm">Compliance Advisor</div>
-            <div className="text-xs text-white/80">KI-gestuetzter Assistent</div>
+            <div className="flex items-center gap-1 mt-0.5">
+              {COUNTRIES.map(({ code, label }) => (
+                <button
+                  key={code}
+                  onClick={() => setSelectedCountry(code)}
+                  className={`px-1.5 py-0.5 text-[10px] font-medium rounded transition-colors ${
+                    selectedCountry === code
+                      ? 'bg-white text-indigo-700'
+                      : 'bg-white/15 text-white/80 hover:bg-white/25'
+                  }`}
+                >
+                  {label}
+                </button>
+              ))}
+            </div>
           </div>
         </div>
         <div className="flex items-center gap-1">