fix: devcontainer env vars, docs, and java version detection (#450)

* 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- Documentation had outdated npm commands (npm run dev vs npm start)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>

---------

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

Author: 3 people

apps/backend/check_java.sh

@@ -4,7 +4,8 @@ echo "Checking Java installation..."
 # Check if java command works
 if command -v java &> /dev/null; then
     echo "✓ Java found in PATH"
-    java -version 2>&1 | head -1
+    # Filter out JAVA_TOOL_OPTIONS message and show actual version line
+    java -version 2>&1 | grep -E '(openjdk|java) version' | head -1
 else
     echo "✗ Java not in PATH"
 fi
@@ -14,7 +15,8 @@ if [ -n "$JAVA_HOME" ]; then
     echo "✓ JAVA_HOME is set: $JAVA_HOME"
     if [ -x "$JAVA_HOME/bin/java" ]; then
         echo "✓ Java executable found at JAVA_HOME"
-        "$JAVA_HOME/bin/java" -version 2>&1 | head -1
+        # Filter out JAVA_TOOL_OPTIONS message and show actual version line
+        "$JAVA_HOME/bin/java" -version 2>&1 | grep -E '(openjdk|java) version' | head -1
     else
         echo "✗ Java executable not found at JAVA_HOME"
     fi

apps/backend/run.sh

@@ -7,15 +7,17 @@ REQUIRED_JAVA_VERSION="${REQUIRED_JAVA_VERSION:-21}"
 ensure_java() {
     if command -v java &> /dev/null; then
         local java_version
-        java_version=$(java -version 2>&1 | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
+        # Filter out JAVA_TOOL_OPTIONS message and get version from "openjdk version" or "java version" line
+        java_version=$(java -version 2>&1 | grep -E '(openjdk|java) version' | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
         if [ "$java_version" -ge "$REQUIRED_JAVA_VERSION" ] 2>/dev/null; then
             return 0
         fi
     fi
 
     if [ -n "${JAVA_HOME:-}" ] && [ -x "$JAVA_HOME/bin/java" ]; then
         local java_version
-        java_version=$("$JAVA_HOME/bin/java" -version 2>&1 | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
+        # Filter out JAVA_TOOL_OPTIONS message and get version from "openjdk version" or "java version" line
+        java_version=$("$JAVA_HOME/bin/java" -version 2>&1 | grep -E '(openjdk|java) version' | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
         if [ "$java_version" -ge "$REQUIRED_JAVA_VERSION" ] 2>/dev/null; then
             export PATH="$JAVA_HOME/bin:$PATH"
             return 0

scripts/run-sonarqube-mcp.sh

@@ -5,7 +5,8 @@
 find_java21() {
     # Check JAVA_HOME first
     if [ -n "$JAVA_HOME" ]; then
-        JAVA_VERSION=$("$JAVA_HOME/bin/java" -version 2>&1 | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
+        # Filter out JAVA_TOOL_OPTIONS message and get version from "openjdk version" or "java version" line
+        JAVA_VERSION=$("$JAVA_HOME/bin/java" -version 2>&1 | grep -E '(openjdk|java) version' | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
         if [ "$JAVA_VERSION" -ge 21 ] 2>/dev/null; then
             echo "$JAVA_HOME/bin/java"
             return 0

scripts/setup-mcp-sonarqube.sh

@@ -14,7 +14,8 @@ echo "Setting up SonarQube MCP Server for Claude Code..."
 # Check for Java 21+
 check_java() {
     if command -v java &> /dev/null; then
-        JAVA_VERSION=$(java -version 2>&1 | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
+        # Filter out JAVA_TOOL_OPTIONS message and get version from "openjdk version" or "java version" line
+        JAVA_VERSION=$(java -version 2>&1 | grep -E '(openjdk|java) version' | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
         if [ "$JAVA_VERSION" -ge "$REQUIRED_JAVA_VERSION" ] 2>/dev/null; then
             echo "Found Java $JAVA_VERSION"
             return 0
@@ -23,7 +24,8 @@ check_java() {
 
     # Check for JAVA_HOME with JDK 21+
     if [ -n "$JAVA_HOME" ]; then
-        JAVA_VERSION=$("$JAVA_HOME/bin/java" -version 2>&1 | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
+        # Filter out JAVA_TOOL_OPTIONS message and get version from "openjdk version" or "java version" line
+        JAVA_VERSION=$("$JAVA_HOME/bin/java" -version 2>&1 | grep -E '(openjdk|java) version' | head -1 | cut -d'"' -f2 | cut -d'.' -f1)
         if [ "$JAVA_VERSION" -ge "$REQUIRED_JAVA_VERSION" ] 2>/dev/null; then
             echo "Found Java $JAVA_VERSION at JAVA_HOME"
             return 0