fix: fast node creation, first-run modal, simplified docs

- Skip AI calls when no valid OpenAI key (fixes 9-13s timeout)
- Add first-run modal prompting for API key
- Rewrite README for first-time users
- Add /api/health endpoint
- Remove all Anthropic references (not used in OS)
- Fix bootstrap script (dev:local → dev)
- Fix next.config.js devIndicators warning
- Add Node 18+ version check

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.example

@@ -1,22 +1,16 @@
-# Database Configuration - SQLite (production ready)
-# Paths use sensible defaults if not specified
-# SQLITE_DB_PATH=$HOME/Library/Application Support/RA-H/db/rah.sqlite
+# RA-H OS Configuration
+# Copy to .env.local: cp .env.example .env.local
+
+# OpenAI API Key (optional)
+# Enables: auto-descriptions, smart tagging, semantic search
+# Get one at: https://platform.openai.com/api-keys
+OPENAI_API_KEY=
+
+# Database path (defaults work for most users)
+# SQLITE_DB_PATH=~/Library/Application Support/RA-H/db/rah.sqlite
 SQLITE_VEC_EXTENSION_PATH=./vendor/sqlite-extensions/vec0.dylib
 
-# AI API Keys (main orchestrator + mini agents)
-ANTHROPIC_API_KEY=your-anthropic-api-key-here
-OPENAI_API_KEY=your-openai-api-key-here
-
-# Optional overrides specifically for ra-h orchestration/delegation
-RAH_ORCHESTRATOR_ANTHROPIC_API_KEY=
-RAH_DELEGATE_OPENAI_API_KEY=
-
-# Voice TTS defaults
-RAH_TTS_MODEL=gpt-4o-mini-tts
-RAH_TTS_VOICE=ash
-RAH_TTS_COST_PER_1K_CHAR_USD=0.015
-
-# Application Configuration
+# App config (no changes needed)
 NODE_ENV=development
 PORT=3000
 NEXT_PUBLIC_APP_URL=http://localhost:3000