init: kovakemlak-crm project scaffold

- Next.js 16 + Appwrite multi-tenant emlak CRM
- Database: kovakemlak-db (properties, customers, customer_searches, property_matches, presentations, investors, activities, tenant_settings)
- Same stack as isletmem-kovakcrm (shadcn/ui template base)
- Modules: portföy, müşteri takibi, arama kriterleri, otomatik eşleştirme, sunum linki, yatırımcı portalı

src/hooks/use-theme.ts

@@ -0,0 +1,11 @@
+import * as React from "react"
+import { ThemeProviderContext } from "@/contexts/theme-context"
+
+export const useTheme = () => {
+  const context = React.useContext(ThemeProviderContext)
+
+  if (context === undefined)
+    throw new Error("useTheme must be used within a ThemeProvider")
+
+  return context
+}