feat: add deployment guide, nginx/systemd configs, switch to adapter-node

- Add docs/DEPLOYMENT.md: step-by-step Proxmox LXC guide (Debian 13,
  PostgreSQL, nginx reverse proxy, systemd services)
- Add nginx/innercontext.conf: proxy /api/ → uvicorn, /mcp/ → uvicorn
  with SSE streaming support, / → SvelteKit Node server
- Add systemd/innercontext.service and innercontext-node.service
- Switch frontend from adapter-auto to adapter-node (required for
  +page.server.ts form actions); install adapter-node 5.5.4
- Update README.md: add frontend, MCP sections; fix /skin-snapshots →
  /skincare; update repo layout
- Replace frontend/README.md generic Svelte template with project docs

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

frontend/README.md

@@ -1,42 +1,74 @@
-# sv
+# innercontext — frontend
 
-Everything you need to build a Svelte project, powered by [`sv`](https://github.com/sveltejs/cli).
+SvelteKit web UI for innercontext. Provides a browser interface for managing skincare products, routines, health data, and skin condition snapshots.
 
-## Creating a project
+## Stack
 
-If you're seeing this, you've probably already done this step. Congrats!
+- **Framework:** SvelteKit 2, Svelte 5 (Runes)
+- **Language:** TypeScript
+- **Styles:** Tailwind CSS v4
+- **Components:** shadcn-svelte (bits-ui)
+- **Adapter:** `@sveltejs/adapter-node` (required — uses `+page.server.ts` form actions)
 
-```sh
-# create a new project
-npx sv create my-app
+## Development
+
+```bash
+# Install dependencies
+pnpm install
+
+# Start dev server (API proxied to localhost:8000)
+pnpm dev
 ```
 
-To recreate this project with the same configuration:
+The backend must be running at `http://localhost:8000`. See `../backend/` for setup instructions.
 
-```sh
-# recreate this project
-pnpm dlx sv create --template minimal --types ts --install pnpm frontend
+## Environment variables
+
+| Variable | Description | Default |
+|---|---|---|
+| `PUBLIC_API_BASE` | Base URL of the FastAPI backend | `http://localhost:8000` |
+
+Set `PUBLIC_API_BASE` at **build time** for production:
+
+```bash
+PUBLIC_API_BASE=http://innercontext.lan/api pnpm build
 ```
 
-## Developing
+## Building for production
 
-Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
-
-```sh
-npm run dev
-
-# or start the server and open the app in a new browser tab
-npm run dev -- --open
+```bash
+pnpm build
+# Output: build/
 ```
 
-## Building
+Run the production server:
 
-To create a production version of your app:
-
-```sh
-npm run build
+```bash
+node build/index.js
 ```
 
-You can preview the production build with `npm run preview`.
+Or use the provided systemd service: `../systemd/innercontext-node.service`.
 
-> To deploy your app, you may need to install an [adapter](https://svelte.dev/docs/kit/adapters) for your target environment.
+## Routes
+
+| Route | Description |
+|---|---|
+| `/` | Dashboard |
+| `/products` | Product list |
+| `/products/new` | Add product |
+| `/products/[id]` | Product detail / edit |
+| `/routines` | Routine list |
+| `/routines/new` | Create routine |
+| `/routines/[id]` | Routine detail |
+| `/health/medications` | Medications |
+| `/health/lab-results` | Lab results |
+| `/skin` | Skin condition snapshots |
+
+## Key files
+
+| File | Purpose |
+|---|---|
+| `src/lib/api.ts` | API client (typed fetch wrappers) |
+| `src/lib/types.ts` | Shared TypeScript types |
+| `src/app.css` | Tailwind v4 theme + global styles |
+| `svelte.config.js` | SvelteKit config (adapter-node) |