feat: add direnv and improve devcontainer environment setup (#451)

* fix: add missing simpleaccounts_db env vars and update documentation

Issues fixed:
- Backend failed to start due to missing SIMPLEACCOUNTS_DB_* environment variables
- post-start.sh used wrong hostnames (localhost vs db/redis)
- Documentation had outdated npm commands (npm run dev vs npm start)

Changes:
- Add SIMPLEACCOUNTS_DB_HOST, SIMPLEACCOUNTS_DB_PORT, etc. to .env.example
- Add same env vars to Coder template.tf for seamless Coder support
- Update post-start.sh to auto-detect Coder vs DevContainer environment
- Fix npm commands in CLAUDE.md, AGENTS.md, and other docs
- Update README.md architecture diagram to show localhost networking

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

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

* fix: handle java_tool_options in java version detection scripts

The JAVA_TOOL_OPTIONS environment variable outputs a message that was
being captured by `head -1`, causing Java version detection to fail
even when Java 21+ was properly installed.

Fixed by using `grep -E '(openjdk|java) version'` to filter for the
actual version line before extracting the version number.

Files fixed:
- apps/backend/run.sh
- apps/backend/check_java.sh
- scripts/setup-mcp-sonarqube.sh
- scripts/run-sonarqube-mcp.sh

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

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

* feat: add direnv for automatic .env loading in devcontainer

- Add direnv to Dockerfile apt-get install
- Configure direnv hook in bashrc via post-create.sh
- Auto-create .envrc that loads all .env files
- Add .envrc to .gitignore

This enables automatic environment variable loading when entering
the workspace directory, loading from .devcontainer/.env and any
local override files.

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

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

* chore: update sonarqube url and package-lock

- Update SONARQUBE_URL to sonarqube.datainn.io in .mcp.json
- Update package-lock.json

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

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

---------

Co-authored-by: Developer <developer@simpleaccounts.io>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: 3 people

.devcontainer/Dockerfile

@@ -34,6 +34,7 @@ RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     && echo "deb [signed-by=/usr/share/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.31/deb/ /" > /etc/apt/sources.list.d/kubernetes.list \
     && apt-get update \
     && apt-get -y install --no-install-recommends \
+        direnv \
         docker-ce-cli \
         docker-compose-plugin \
         gh \

.devcontainer/post-create.sh

@@ -146,6 +146,52 @@ else
     echo "  ⚠️  Not in a git repository, skipping git hooks"
 fi
 
+# ============================================
+# Setup direnv for automatic .env loading
+# ============================================
+echo "🔧 Setting up direnv..."
+
+# Add direnv hook to bashrc if not already present
+if ! grep -q "direnv hook bash" "$TARGET_HOME/.bashrc" 2>/dev/null; then
+    echo '' >> "$TARGET_HOME/.bashrc"
+    echo '# direnv hook for automatic .env loading' >> "$TARGET_HOME/.bashrc"
+    echo 'eval "$(direnv hook bash)"' >> "$TARGET_HOME/.bashrc"
+    echo "  ✅ Added direnv hook to .bashrc"
+fi
+
+# Create .envrc file if it doesn't exist
+if [ ! -f ".envrc" ]; then
+    cat > .envrc << 'ENVRCEOF'
+# direnv configuration for SimpleAccounts-UAE
+# This file loads environment variables from .env files
+
+# Load main devcontainer environment variables
+if [ -f .devcontainer/.env ]; then
+  dotenv .devcontainer/.env
+fi
+
+# Load local overrides (not committed to git)
+if [ -f .devcontainer/.env.local ]; then
+  dotenv .devcontainer/.env.local
+fi
+
+# Load root .env if it exists (not committed to git)
+if [ -f .env ]; then
+  dotenv .env
+fi
+
+# Load root .env.local if it exists (not committed to git)
+if [ -f .env.local ]; then
+  dotenv .env.local
+fi
+ENVRCEOF
+    echo "  ✅ Created .envrc file"
+fi
+
+# Allow direnv for this directory
+direnv allow . 2>/dev/null || true
+echo "  ✅ direnv configured"
+
 # ============================================
 # Create local environment files
 # ============================================

.gitignore

@@ -43,6 +43,7 @@ lerna-debug.log*
 .env
 .env.local
 .mcp.env
+.envrc
 
 # DevContainer secrets
 .devcontainer/.env

.mcp.json

@@ -8,7 +8,7 @@
         "[ -f .mcp.env ] && export $(grep -v '^#' .mcp.env | xargs); JAVA_CMD=$(/usr/libexec/java_home -v 21 2>/dev/null)/bin/java || JAVA_CMD=java; exec $JAVA_CMD -jar $HOME/.local/share/mcp-servers/sonarqube-mcp-server.jar"
       ],
       "env": {
-        "SONARQUBE_URL": "https://sonar-r0w40gg48okc00wkc08oowo4.46.62.252.63.sslip.io",
+        "SONARQUBE_URL": "https://sonarqube.datainn.io",
         "STORAGE_PATH": "${HOME}/.local/share/mcp-servers/storage"
       }
     }