feat: AI security controls + PostgreSQL hardening (Week 1 Quick Wins)

AI Security (EGAI 4.3.1.3, 4.3.1.4, 4.1.3.1, IAAI 3.6.26):
- AI Disclaimer banner in ChatPanel: "AI responses may be inaccurate"
- "AI Generated" violet badge on: chat messages, AI summaries,
  project narratives, AI-generated cover images
- HITL: system prompt now requires explicit user confirmation
  before any data mutation (strongly worded instruction)
- Mutation tool audit logging: all 31 write tools logged with
  tool name, params, userId, userRole via Pino

PostgreSQL Hardening (PG Standard V1.6):
- Audit logging: log_connections, log_disconnections, log_statement=ddl,
  log_min_duration_statement=1000 in docker-compose
- SUPERUSER removal script: scripts/harden-postgres.sh
  (NOSUPERUSER + minimal GRANT for app user)
- Health check: pg_isready -U capakraken -d capakraken
- Documentation: security-architecture.md Section 12 updated

Controls closed: EGAI 4.1.3.1, 4.3.1.3, 4.3.1.4, PG 3.3, 3.5

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

apps/web/src/components/assistant/ChatMessage.tsx

@@ -120,7 +120,15 @@ export function ChatMessage({ role, content }: ChatMessageProps) {
         {isUser ? (
           <span className="whitespace-pre-wrap break-words">{content}</span>
         ) : (
-          <div className="space-y-0.5 break-words">{rendered}</div>
+          <>
+            <span className="inline-flex items-center gap-1 px-1.5 py-0.5 text-[10px] font-medium rounded bg-violet-100 text-violet-700 dark:bg-violet-900/30 dark:text-violet-300 mb-1.5">
+              <svg className="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9.663 17h4.673M12 3v1m6.364 1.636l-.707.707M21 12h-1M4 12H3m3.343-5.657l-.707-.707m2.828 9.9a5 5 0 117.072 0l-.548.547A3.374 3.374 0 0014 18.469V19a2 2 0 11-4 0v-.531c0-.895-.356-1.754-.988-2.386l-.548-.547z" />
+              </svg>
+              AI Generated
+            </span>
+            <div className="space-y-0.5 break-words">{rendered}</div>
+          </>
         )}
       </div>
     </div>

apps/web/src/components/assistant/ChatPanel.tsx

@@ -213,6 +213,11 @@ export function ChatPanel({ onClose }: { onClose: () => void }) {
         </div>
       </div>
 
+      {/* AI Disclaimer (EGAI 4.3.1.4) */}
+      <div className="px-3 py-2 text-[11px] text-gray-400 dark:text-gray-500 bg-gray-50 dark:bg-gray-800/50 border-b border-gray-200 dark:border-gray-700">
+        AI responses may be inaccurate. Always verify critical information before acting on it.
+      </div>
+
       {/* Messages */}
       <div ref={scrollRef} className="flex-1 overflow-y-auto px-3 py-3 space-y-3">
         {messages.length === 0 && !isLoading && (