style: Rename System to About and update REW agency URL

frontend/app/page.tsx

@@ -23,7 +23,7 @@ const tabs = [
   "Proposal Draft",
   "Reports",
   "History",
-  "System",
+  "About",
 ] as const;
 
 type Tab = (typeof tabs)[number];
@@ -219,7 +219,7 @@ export default function HomePage() {
             {activeTab === "Proposal Draft" && <ProposalDraft proposal={analysisResult?.proposal_draft ?? ""} />}
             {activeTab === "Reports" && <Reports reportMarkdown={analysisResult?.report_markdown ?? ""} />}
             {activeTab === "History" && <AnalysisHistory history={analysisHistory} />}
-            {activeTab === "System" && <SystemInfo />}
+            {activeTab === "About" && <SystemInfo />}
           </div>
         </main>
       </div>

frontend/components/Sidebar.tsx

@@ -11,7 +11,7 @@ type SidebarTab =
   | "Proposal Draft"
   | "Reports"
   | "History"
-  | "System";
+  | "About";
 
 type Props = {
   tabs: readonly SidebarTab[];

frontend/components/SystemInfo.tsx

@@ -19,14 +19,14 @@ export default function SystemInfo() {
           <div className="w-20 h-20 premium-gradient rounded-3xl flex items-center justify-center text-white font-black text-3xl mx-auto mb-8 shadow-2xl shadow-purple-500/40">
             REW
           </div>
-          <h2 className="text-4xl font-bold text-white mb-4 tracking-tight">System Architecture</h2>
+          <h2 className="text-4xl font-bold text-white mb-4 tracking-tight">About AndesOps AI</h2>
           <p className="text-slate-400 max-w-2xl mx-auto text-lg leading-relaxed">
             AndesOps AI is a state-of-the-art platform developed by <span className="text-white font-bold italic">REW Agency</span>. 
             Engineered to transform public procurement through agentic intelligence.
           </p>
           <div className="mt-8 flex items-center justify-center gap-6">
-            <a href="https://rewchile.cl" target="_blank" className="px-6 py-3 rounded-2xl bg-white/5 border border-white/10 text-sm font-bold text-slate-300 hover:bg-white/10 transition-all">
-              Visit rewchile.cl
+            <a href="https://www.rew.cl" target="_blank" className="px-6 py-3 rounded-2xl bg-white/5 border border-white/10 text-sm font-bold text-slate-300 hover:bg-white/10 transition-all">
+              Visit rew.cl
             </a>
             <div className="h-6 w-px bg-white/10" />
             <span className="text-xs font-bold uppercase tracking-[0.3em] text-purple-400">Powered by AndesOps</span>