feat: initialize warpbox.dev project structure and backend

Initialize the repository with the core Go backend architecture and a frontend mockup for warpbox.dev, a self-hosted file-sharing application.

- Set up Go backend modules for configuration, HTTP server, middleware, handlers, and templates.
- Add local development scripts, environment templates, and basic project configuration.
- Include a React-based frontend mockup under the docs directory.

docs/Mock-Up/Mockup Magic/src/routes/admin.logs.tsx

@@ -0,0 +1,46 @@
+import { createFileRoute } from "@tanstack/react-router";
+import { AppShell } from "@/components/layout/AppShell";
+import { Card, CardContent } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+import { Input } from "@/components/ui/input";
+import { mockLogs } from "@/lib/mock-data";
+
+export const Route = createFileRoute("/admin/logs")({
+  head: () => ({ meta: [{ title: "Admin · Logs — warpbox.dev" }] }),
+  component: Logs,
+});
+
+function Logs() {
+  return (
+    <AppShell variant="admin" title="Admin · Logs">
+      <Card>
+        <CardContent className="p-0">
+          <div className="flex flex-wrap items-center gap-2 border-b p-4">
+            <Input placeholder="Filter messages…" className="h-8 max-w-xs" />
+            <Select defaultValue="all">
+              <SelectTrigger className="h-8 w-32"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                <SelectItem value="all">All levels</SelectItem>
+                <SelectItem value="info">Info</SelectItem>
+                <SelectItem value="warn">Warn</SelectItem>
+                <SelectItem value="error">Error</SelectItem>
+              </SelectContent>
+            </Select>
+          </div>
+          <div className="font-mono text-xs">
+            {mockLogs.map((l, i) => (
+              <div key={i} className="flex items-start gap-3 border-b px-4 py-2">
+                <span className="text-muted-foreground">{l.ts}</span>
+                <Badge variant={l.level === "error" ? "destructive" : l.level === "warn" ? "outline" : "secondary"} className="h-5">
+                  {l.level}
+                </Badge>
+                <span className="flex-1">{l.msg}</span>
+              </div>
+            ))}
+          </div>
+        </CardContent>
+      </Card>
+    </AppShell>
+  );
+}