Refactor: Move Docker files to project root and update documentation

Moved Dockerfile and docker-compose.yml from docker/ to root directory for simpler workflow.
This allows running 'docker compose up' directly without -f flag.

Changes:
- Moved docker/Dockerfile -> Dockerfile
- Moved docker/docker-compose.yml -> docker-compose.yml
- Updated docker-compose.yml context and env_file paths
- Updated README.md with simplified Docker commands
- Updated CLAUDE_CODE_PROMPT.md project structure
- Moved .claude/instructions.md to root (from technotes/)
- Updated all documentation to reflect new structure

Now deployment is simpler:
  docker compose up -d --build

instead of:
  docker compose -f docker/docker-compose.yml up -d --build

docker/Dockerfile

@@ -1,35 +0,0 @@
-# mc-webui Dockerfile
-# Python 3.11+ with Flask and meshcore-cli
-
-FROM python:3.11-slim
-
-# Set working directory
-WORKDIR /app
-
-# Install system dependencies
-RUN apt-get update && apt-get install -y \
-    gcc \
-    && rm -rf /var/lib/apt/lists/*
-
-# Copy requirements first for better layer caching
-COPY requirements.txt .
-
-# Install Python dependencies
-RUN pip install --no-cache-dir -r requirements.txt
-
-# Install meshcore-cli
-RUN pip install --no-cache-dir meshcore-cli
-
-# Copy application code
-COPY app/ ./app/
-
-# Expose Flask port
-EXPOSE 5000
-
-# Environment variables (can be overridden by docker-compose)
-ENV FLASK_HOST=0.0.0.0
-ENV FLASK_PORT=5000
-ENV FLASK_DEBUG=false
-
-# Run the application
-CMD ["python", "-m", "app.main"]

docker/docker-compose.yml

@@ -1,32 +0,0 @@
-version: '3.8'
-
-services:
-  mc-webui:
-    build:
-      context: ..
-      dockerfile: docker/Dockerfile
-    container_name: mc-webui
-    restart: unless-stopped
-    ports:
-      - "${FLASK_PORT:-5000}:5000"
-    devices:
-      - "${MC_SERIAL_PORT}:${MC_SERIAL_PORT}"
-    volumes:
-      - "${MC_CONFIG_DIR}:/root/.config/meshcore:rw"
-    environment:
-      - MC_SERIAL_PORT=${MC_SERIAL_PORT}
-      - MC_DEVICE_NAME=${MC_DEVICE_NAME}
-      - MC_CONFIG_DIR=/root/.config/meshcore
-      - MC_REFRESH_INTERVAL=${MC_REFRESH_INTERVAL:-60}
-      - MC_INACTIVE_HOURS=${MC_INACTIVE_HOURS:-48}
-      - FLASK_HOST=${FLASK_HOST:-0.0.0.0}
-      - FLASK_PORT=${FLASK_PORT:-5000}
-      - FLASK_DEBUG=${FLASK_DEBUG:-false}
-    env_file:
-      - ../.env
-    healthcheck:
-      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:5000/api/status')"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-      start_period: 10s