Remove nginx/webapp container; single Go server serves SPA + API

- Add root Dockerfile: node build → copy dist into Go embed path → distroless binary
- Update docker-compose: one service (api on :9050), DB renamed ralph→pamietnik
- Remove references to RALPH/reisejournal across all docs and configs

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

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-**Pamietnik** (Codename: RALPH) is a life/travel journal consisting of three components:
+**Pamietnik**  is a life/travel journal consisting of three components:
 - `app/` — Android app (Kotlin + Jetpack Compose)
 - `backend/` — Go REST API + server-side rendered Web UI
 - `README.md` — single source of truth for architecture, requirements, and backlog
@@ -28,7 +28,7 @@ go run ./cmd/server            # starts API on :8080 (default)
 ```
 
 **Env vars** (with defaults):
-- `DATABASE_URL` — `postgres://ralph:ralph@localhost:5432/ralph?sslmode=disable`
+- `DATABASE_URL` — `postgres://pamietnik:pamietnik@localhost:5432/pamietnik?sslmode=disable`
 - `LISTEN_ADDR` — `:8080`
 - `UPLOAD_DIR` — `./uploads`
 
@@ -93,7 +93,7 @@ cd app
 ### Android Architecture
 
 ```
-de.jacek.reisejournal/
+de.jacek.pamietnik/
   domain/       Trackpoint domain model
   data/         Room entities, DAOs, local DB
   service/      Background location foreground service