feat(docs): add README with project overview, Docker instructions, and environment variables

README.md

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+# k-tv
+
+Self-hosted linear TV channel orchestration. Turns a personal media library into broadcast-style channels.
+
+## Stack
+
+- **Backend** — Rust (Axum), SQLite/PostgreSQL, Jellyfin
+- **Frontend** — Next.js 16, React 19, TanStack Query, Tailwind v4, shadcn/ui
+
+---
+
+## Docker
+
+Registry: `registry.gabrielkaszewski.dev`
+
+### Build
+
+`NEXT_PUBLIC_API_URL` is baked into the frontend bundle at build time — always pass it explicitly.
+
+```bash
+# Backend
+docker build -t registry.gabrielkaszewski.dev/k-tv-backend:latest ./k-tv-backend
+
+# Frontend — NEXT_PUBLIC_API_URL required
+docker build \
+  --build-arg NEXT_PUBLIC_API_URL=https://tv-api.gabrielkaszewski.dev/api/v1 \
+  -t registry.gabrielkaszewski.dev/k-tv-frontend:latest \
+  ./k-tv-frontend
+```
+
+### Push
+
+```bash
+docker push registry.gabrielkaszewski.dev/k-tv-backend:latest
+docker push registry.gabrielkaszewski.dev/k-tv-frontend:latest
+```
+
+### Build + push (one-liner)
+
+```bash
+docker build -t registry.gabrielkaszewski.dev/k-tv-backend:latest ./k-tv-backend && \
+docker push registry.gabrielkaszewski.dev/k-tv-backend:latest && \
+docker build \
+  --build-arg NEXT_PUBLIC_API_URL=https://tv-api.gabrielkaszewski.dev/api/v1 \
+  -t registry.gabrielkaszewski.dev/k-tv-frontend:latest \
+  ./k-tv-frontend && \
+docker push registry.gabrielkaszewski.dev/k-tv-frontend:latest
+```
+
+### Deploy (on server)
+
+```bash
+docker compose -f compose.yml -f compose.traefik.yml pull
+docker compose -f compose.yml -f compose.traefik.yml up -d
+```
+
+---
+
+## Ports
+
+| Service  | Port |
+|----------|------|
+| Backend  | 3000 |
+| Frontend | 3001 |
+
+## Env vars
+
+| Var | Where | Note |
+|-----|-------|------|
+| `NEXT_PUBLIC_API_URL` | frontend build arg | Baked in at build time — must point to the public backend URL |
+| `API_URL` | frontend runtime env | Server-side only (Next.js API routes). Set in compose. |
+| `DATABASE_URL` | backend | `sqlite:///app/data/k-tv.db` or postgres DSN |
+| `SESSION_SECRET` | backend | Change in production |