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/.lovable/plan.md

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+# Warpbox.dev UI Mockup Plan
+
+Build a **static, non-functional mockup** of all key Warpbox.dev pages using shadcn/ui (already installed) + Tailwind. No backend, no real uploads — just realistic UI with seeded dummy data so you can review look & feel.
+
+## Shell & layout
+
+- `src/components/layout/PublicHeader.tsx` — logo, About, Docs, Login, Register.
+- `src/components/layout/AppSidebar.tsx` — authenticated sidebar (Dashboard, My files, Shared links, Settings, Admin).
+- `src/components/layout/AdminSidebar.tsx` — admin sidebar (Overview, Files, Users, Storage, Settings, Logs).
+- `src/components/layout/Footer.tsx` — version, ToS, Privacy.
+- Shared `AppShell` wrapper used by authenticated / admin route groups (via TanStack layout routes `_app.tsx`, `_admin.tsx`).
+
+## Routes (each its own file under `src/routes/`)
+
+Public / anonymous:
+- `index.tsx` — Stage 1 landing: large drop zone, upload limits panel, "Advanced options" (expiry / max downloads / password), simulated upload list with progress + copy-link rows, post-upload success card.
+- `about.tsx` — short marketing/about page.
+- `docs.tsx` — docs landing with curl/ShareX snippets.
+- `login.tsx`, `register.tsx` — centered auth cards.
+- `d.$id.tsx` — public download page (file preview, size, expiry, download button, password prompt variant).
+
+Authenticated (`_app/` layout with sidebar):
+- `_app/dashboard.tsx` — metric cards (storage used, files, recent activity) + recent uploads table.
+- `_app/files.tsx` — folder tree (left), breadcrumbs, toolbar (New folder / Upload / Share), table+card view toggle, search.
+- `_app/shared.tsx` — list of share links with expiry, downloads count, revoke.
+- `_app/settings.tsx` — profile, password, API tokens, ShareX config download.
+
+Admin (`_admin/` layout):
+- `_admin/overview.tsx` — 4 metric cards, sparkline/bar chart (recharts), recent uploads + recent flags tables.
+- `_admin/files.tsx` — filters panel (date / status / owner type / size), files table with bulk actions.
+- `_admin/users.tsx` — users table (email, role, storage used, status, actions).
+- `_admin/storage.tsx` — backend status (local/S3), usage gauges, cleanup controls.
+- `_admin/logs.tsx` — log stream table with level filter.
+- `_admin/settings.tsx` — instance branding, limits, retention, SMTP.
+
+## Components
+
+Built with shadcn primitives already present: `card`, `button`, `input`, `table`, `tabs`, `dialog`, `dropdown-menu`, `sidebar`, `progress`, `badge`, `separator`, `sonner`, `chart`.
+
+Reusable mockup pieces:
+- `UploadDropzone` (visual only, fake progress on click).
+- `FileRow` (name, size, expiry badge, copy-link, delete).
+- `MetricCard` (label, value, delta).
+- `FolderTree` (static nested list).
+- `EmptyState`.
+
+## Data
+
+Single `src/lib/mock-data.ts` with seeded files, users, logs, metrics. No network calls, no Cloud enablement.
+
+## Design system
+
+Keep existing oklch tokens in `src/styles.css`. Add subtle additions only if needed (e.g. `--success`, `--warning` already implied via chart tokens — extend if missing). Mobile-responsive: sidebar collapses to sheet, tables become card lists at `sm`.
+
+## Out of scope (mockup only)
+
+- No real file upload, auth, storage, or API.
+- No Lovable Cloud / Supabase.
+- No route guards — admin/auth pages are publicly viewable for review.
+- No i18n, no theming switcher beyond existing light/dark tokens.
+
+## Navigation aid
+
+Add a small dev-only "Mockup pages" dropdown in the public header listing every route, so you can jump between screens during review.

docs/Mock-Up/Mockup Magic/.lovable/project.json

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+{
+  "schemaVersion": 1,
+  "template": "tanstack_start_ts_2026-05-12"
+}