Add 4 AI bookkeeping features

Feature 7: Bank Rec Auto-Match — AiSuggestMatches endpoint scores uncleared
transactions vs statement ending balance; AI Auto-Match panel in Reconcile.cshtml
with confidence highlights and Apply All button.

Feature 8: Late Payment Prediction — PredictLatePayments endpoint scores open AR
customers by risk (high/medium/low) using historical avg-days-to-pay + late rate;
rendered as badge table in AR Aging view via ar-aging-ai.js.

Feature 9: Natural Language Financial Queries — FinancialQuery GET page + RunFinancialQuery
POST; 12-month context snapshot pre-loaded; answers grounded in real data with
supporting facts, follow-up suggestions, session history, and example chips.

Feature 10: Recurring Bill Detection — RunRecurringDetection scans 12 months of bills
for vendor payment patterns (monthly/quarterly/annual); card grid view in Bills/RecurringDetection.cshtml
with confidence badges, next-expected-date, and suggested actions.

Supporting: 4 new DTO groups in AccountingAiDtos.cs, 4 method signatures in
IAccountingAiService.cs, 4 implementations in AccountingAiService.cs, 4 new
AiFeatures constants, 2 new Landing page AI report cards.

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

src/PowderCoating.Web/Views/Reports/Landing.cshtml

@@ -123,6 +123,22 @@
             <p>AI scans recent bills and expense trends for duplicate entries, unusual amounts, and accounts running over their historical average.</p>
             <div class="report-arrow">Run analysis <i class="bi bi-arrow-right"></i></div>
         </a>
+        <a asp-controller="Reports" asp-action="FinancialQuery" class="report-card">
+            <div class="report-card-icon" style="background:#eff6ff;color:#2563eb;">
+                <i class="bi bi-chat-dots"></i>
+            </div>
+            <h5>Ask Your Financials</h5>
+            <p>Ask Claude plain-English questions about your revenue, expenses, and AR. Answers are grounded in your actual financial data.</p>
+            <div class="report-arrow">Ask a question <i class="bi bi-arrow-right"></i></div>
+        </a>
+        <a asp-controller="Reports" asp-action="ArAging" class="report-card">
+            <div class="report-card-icon" style="background:#fef3c7;color:#d97706;">
+                <i class="bi bi-hourglass-split"></i>
+            </div>
+            <h5>AR Aging + Risk Prediction</h5>
+            <p>View outstanding invoices by aging bucket, then run AI payment risk scoring to prioritize your follow-up calls.</p>
+            <div class="report-arrow">View aging <i class="bi bi-arrow-right"></i></div>
+        </a>
     </div>
 </div>