chore(repo): remove broken/undocumented Docker files (#58)

The Dockerfile, docker-compose.yml, and .dockerignore are removed because
the Dockerfile is structurally broken AND Docker is not a documented
runtime for OCP.

### Evidence — Dockerfile is broken

The Dockerfile COPYs only 3 files:

```
COPY server.mjs ./
COPY setup.mjs ./
COPY package.json ./
```

But `setup.mjs:43` reads `models.json` at runtime
(`JSON.parse(readFileSync(join(__dirname, "models.json"), ...))`),
and `server.mjs` requires `keys.mjs`, `dashboard.html`, etc. The
container as built would crash on first run.

### Evidence — Docker is undocumented

```
$ grep -i docker README.md AGENTS.md CLAUDE.md
# 0 hits
```

No README install path, no AGENTS.md runtime mention, no CLAUDE.md
release-kit reference. These files were ghost infrastructure.

### Why delete vs. fix

Fixing the Dockerfile to actually work would require: COPYing 6+ files,
verifying the container can write to `~/.openclaw/`, deciding on auth
mounting (claude CLI binary + auth state), and adding documentation
across README/AGENTS/CLAUDE. None of that is justified by a request.

Easier to remove the dead files now and reintroduce a working
Dockerfile when there's an actual demand for containerised OCP, with
proper documentation alongside.

Refs: audit (dead infrastructure cleanup).

Co-authored-by: dtzp555 <dtzp555@gmail.com>

.dockerignore

@@ -1,8 +0,0 @@
-.git
-.gitignore
-*.md
-node_modules
-.env
-.env.*
-scripts/
-start.sh

Dockerfile

@@ -1,14 +0,0 @@
-FROM node:20-alpine
-
-WORKDIR /app
-
-COPY server.mjs ./
-COPY setup.mjs ./
-COPY package.json ./
-
-ENV CLAUDE_SESSION_TOKEN="" \
-    CLAUDE_COOKIES=""
-
-EXPOSE 3456
-
-CMD ["node", "server.mjs"]

docker-compose.yml

@@ -1,7 +0,0 @@
-services:
-  claude-proxy:
-    build: .
-    ports:
-      - "3456:3456"
-    env_file: .env
-    restart: unless-stopped