feat(dashboard): real data — metrics, charts, top customers, recent transactions

Dashboard is no longer mock data. Single getDashboardData(tenantId) server
query computes everything in one pass.

New aggregator (lib/appwrite/dashboard-queries.ts):
- Pulls customers, invoices, finance_entries, tasks, services in parallel.
- Derives:
  * metrics: totalCustomers, activeCustomers, monthIncome,
    prevMonthIncome (for delta), outstanding (unpaid invoice total),
    overdueCount, openTasks, urgentTasks
  * monthlyIncome: 12-month income+expense series for area chart
  * topCustomers: 5 highest-grossing customers by paid invoice total
  * recentTransactions: 8 newest finance entries
  * topServices: 5 services by aggregate unit price (placeholder, will
    refine when we have invoice line analytics)
  * newCustomersMonthly: 6-month new customer count for bar chart

Components (dashboard/components/):
- Metrics: 4 cards with trend indicator on income (delta vs previous
  month), warning tone on overdue invoices and urgent tasks.
- IncomeChart: Recharts Area chart, dual income/expense series with
  gradient fills, Turkish month labels.
- TopCustomers: ranked list with progress bars relative to top earner.
- RecentTransactions: list with type badge, signed amount, link to
  /finance for full list.
- CustomerGrowth: BarChart of new customers per month (last 6).
- QuickActions: 4 buttons linking to /customers, /invoices, /calendar,
  /tasks (replaced template's New User/Add Product/etc).

Layout: 4 metric cards row, then income chart + top customers (2-col),
then recent transactions + customer growth (2-col).

Removed:
- src/app/(dashboard)/dashboard-2/ (was the demo page; same components
  re-exported into the real /dashboard from there. Now /dashboard owns
  its components.)
- 'Dashboard 2' entry from CommandSearch; replaced with our actual
  module list (Müşteriler / Hizmetler / Yazılımlarımız / Takvim /
  Görevler / Gelir-Gider / Faturalar).

src/app/(dashboard)/dashboard/page.tsx

@@ -1,18 +1,21 @@
 import { redirect } from "next/navigation";
 
 import { getActiveContext } from "@/lib/appwrite/active-context";
-import { CustomerInsights } from "../dashboard-2/components/customer-insights";
-import { MetricsOverview } from "../dashboard-2/components/metrics-overview";
-import { QuickActions } from "../dashboard-2/components/quick-actions";
-import { RecentTransactions } from "../dashboard-2/components/recent-transactions";
-import { RevenueBreakdown } from "../dashboard-2/components/revenue-breakdown";
-import { SalesChart } from "../dashboard-2/components/sales-chart";
-import { TopProducts } from "../dashboard-2/components/top-products";
+import { getDashboardData } from "@/lib/appwrite/dashboard-queries";
+
+import { CustomerGrowth } from "./components/customer-growth";
+import { IncomeChart } from "./components/income-chart";
+import { Metrics } from "./components/metrics";
+import { QuickActions } from "./components/quick-actions";
+import { RecentTransactions } from "./components/recent-transactions";
+import { TopCustomers } from "./components/top-customers";
 
 export default async function DashboardPage() {
   const ctx = await getActiveContext();
   if (!ctx) redirect("/onboarding");
 
+  const data = await getDashboardData(ctx.tenantId);
+
   const firstName = ctx.user.name?.split(" ")[0] ?? "";
   const companyName = ctx.settings?.companyName ?? "Çalışma alanı";
 
@@ -32,19 +35,17 @@ export default async function DashboardPage() {
       </div>
 
       <div className="@container/main space-y-6">
-        <MetricsOverview />
+        <Metrics data={data.metrics} />
 
         <div className="grid grid-cols-1 gap-6 @5xl:grid-cols-2">
-          <SalesChart />
-          <RevenueBreakdown />
+          <IncomeChart data={data.monthlyIncome} />
+          <TopCustomers data={data.topCustomers} />
         </div>
 
         <div className="grid grid-cols-1 gap-6 @5xl:grid-cols-2">
-          <RecentTransactions />
-          <TopProducts />
+          <RecentTransactions data={data.recentTransactions} />
+          <CustomerGrowth data={data.newCustomersMonthly} />
         </div>
-
-        <CustomerInsights />
       </div>
     </div>
   );