Initial commit — AI-powered coding tutor (Professor)

Next.js 16, React 19, Monaco editor, Anthropic SDK, multi-provider AI,
Wandbox Python execution, iframe HTML preview, SQLite auth + session persistence.

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

start.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+set -e
+
+cd "$(dirname "$0")"
+
+# ─── Colours ──────────────────────────────────────────────────────────────────
+BOLD='\033[1m'
+DIM='\033[2m'
+GREEN='\033[0;32m'
+YELLOW='\033[0;33m'
+RED='\033[0;31m'
+CYAN='\033[0;36m'
+RESET='\033[0m'
+
+echo ""
+echo -e "${BOLD}  Professor — AI Coding Tutor${RESET}"
+echo -e "${DIM}  ─────────────────────────────${RESET}"
+echo ""
+
+# ─── Check Node ───────────────────────────────────────────────────────────────
+if ! command -v node &>/dev/null; then
+  echo -e "${RED}  ✗ Node.js is not installed. Please install Node.js 18+ and try again.${RESET}"
+  exit 1
+fi
+
+NODE_VERSION=$(node -e "process.stdout.write(process.version.slice(1).split('.')[0])")
+if [ "$NODE_VERSION" -lt 18 ]; then
+  echo -e "${RED}  ✗ Node.js 18+ required (found v${NODE_VERSION}).${RESET}"
+  exit 1
+fi
+
+# ─── Check npm deps ───────────────────────────────────────────────────────────
+if [ ! -d "node_modules" ]; then
+  echo -e "${YELLOW}  ⚙  node_modules not found — installing dependencies…${RESET}"
+  npm install --silent
+  echo -e "${GREEN}  ✓ Dependencies installed${RESET}"
+else
+  echo -e "${GREEN}  ✓ Dependencies ready${RESET}"
+fi
+
+# ─── Check .env.local ─────────────────────────────────────────────────────────
+if [ ! -f ".env.local" ]; then
+  echo -e "${YELLOW}  ⚠  .env.local not found — creating it now${RESET}"
+  echo "ANTHROPIC_API_KEY=your_api_key_here" > .env.local
+fi
+
+ANTHROPIC_KEY=$(grep -E "^ANTHROPIC_API_KEY=" .env.local | cut -d= -f2- | tr -d '[:space:]')
+
+if [ -z "$ANTHROPIC_KEY" ] || [ "$ANTHROPIC_KEY" = "your_api_key_here" ]; then
+  echo ""
+  echo -e "${YELLOW}  ⚠  No Anthropic API key found in .env.local${RESET}"
+  echo -e "${DIM}     You can still use OpenRouter, LM Studio, or Ollama via the${RESET}"
+  echo -e "${DIM}     provider settings in the app. To use Claude, add your key:${RESET}"
+  echo ""
+  echo -e "${DIM}     ANTHROPIC_API_KEY=sk-ant-…  →  .env.local${RESET}"
+  echo ""
+else
+  echo -e "${GREEN}  ✓ Anthropic API key found${RESET}"
+fi
+
+# ─── Launch ───────────────────────────────────────────────────────────────────
+PORT=${PORT:-3000}
+
+echo ""
+echo -e "${CYAN}  ➜  Starting dev server on http://localhost:${PORT}${RESET}"
+echo -e "${DIM}     Press Ctrl+C to stop${RESET}"
+echo ""
+
+exec npm run dev -- --port "$PORT"