Improve devcontainer configuration

- Simplify Dockerfile: use golang:1.24 base, install Node via features
- Add proper port forwarding for Pulse (7655 frontend, 7656 API)
- Add Vue Volar extension for frontend development
- Add start-pulse-dev.sh helper script for auto-starting dev server
- Add FRONTEND_DEV_HOST to containerEnv for proper binding
- Add .env.devcontainer to .gitignore (local override file)
- Update frontend dependencies

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

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

.devcontainer/Dockerfile

@@ -1,17 +1,17 @@
-FROM golang:1.24-bookworm
+FROM golang:1.24
 
-# Install Node.js 20
-RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - &&     apt-get install -y nodejs &&     npm install -g npm@latest
+# Set bash as default shell for features
+SHELL ["/bin/bash", "-c"]
 
-# Install additional dev tools
-RUN apt-get update && apt-get install -y     git     make     docker.io     curl     vim     && rm -rf /var/lib/apt/lists/*
+# Install dev tools needed for hot-dev.sh
+RUN apt-get update && apt-get install -y     bash     git     make     curl     vim     sudo     lsof     inotify-tools     && rm -rf /var/lib/apt/lists/*
 
 # Create non-root user
 ARG USERNAME=vscode
 ARG USER_UID=1000
 ARG USER_GID=$USER_UID
 
-RUN groupadd --gid $USER_GID $USERNAME &&     useradd --uid $USER_UID --gid $USER_GID -m $USERNAME &&     apt-get update &&     apt-get install -y sudo &&     echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME &&     chmod 0440 /etc/sudoers.d/$USERNAME
+RUN groupadd --gid $USER_GID $USERNAME &&     useradd --uid $USER_UID --gid $USER_GID -m $USERNAME -s /bin/bash &&     echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME &&     chmod 0440 /etc/sudoers.d/$USERNAME
 
 # Set up Go environment for non-root user
 ENV GOPATH=/go
@@ -21,7 +21,4 @@ RUN mkdir -p $GOPATH/pkg $GOPATH/bin &&     chown -R $USERNAME:$USERNAME $GOPATH
 USER $USERNAME
 WORKDIR /workspace
 
-# Install common Go tools
-RUN go install golang.org/x/tools/gopls@latest &&     go install github.com/go-delve/delve/cmd/dlv@latest
-
 CMD ["/bin/bash"]

.devcontainer/devcontainer.json

@@ -4,12 +4,18 @@
 		"dockerfile": "Dockerfile",
 		"context": "."
 	},
+	"features": {
+		"ghcr.io/devcontainers/features/node:1": {
+			"version": "20"
+		}
+	},
 	"customizations": {
 		"vscode": {
 			"extensions": [
 				"golang.go",
 				"dbaeumer.vscode-eslint",
-				"esbenp.prettier-vscode"
+				"esbenp.prettier-vscode",
+				"vue.volar"
 			],
 			"settings": {
 				"go.gopath": "/go",
@@ -17,7 +23,22 @@
 			}
 		}
 	},
-	"forwardPorts": [8080, 3000],
-	"postCreateCommand": "go version && node --version",
+	"forwardPorts": [7655, 7656],
+	"portsAttributes": {
+		"7655": {
+			"label": "Pulse Frontend",
+			"onAutoForward": "openBrowser"
+		},
+		"7656": {
+			"label": "Pulse Backend API",
+			"onAutoForward": "silent"
+		}
+	},
+	"containerEnv": {
+		"PULSE_DEV_API_HOST": "localhost",
+		"FRONTEND_DEV_HOST": "0.0.0.0",
+		"LAN_IP": "localhost"
+	},
+	"updateContentCommand": "sudo chown -R vscode:vscode /workspaces/pulse && cd frontend-modern && npm install",
 	"remoteUser": "vscode"
 }

.devcontainer/start-pulse-dev.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# Auto-start script for pulse dev environment
+
+PIDFILE="/tmp/pulse-dev.pid"
+LOGFILE="/tmp/pulse-dev.log"
+
+# Check if already running
+if [ -f "$PIDFILE" ] && kill -0 $(cat "$PIDFILE") 2>/dev/null; then
+    echo "Pulse dev server already running (PID: $(cat $PIDFILE))"
+    exit 0
+fi
+
+# Start hot-dev.sh
+cd /workspaces/pulse
+nohup ./scripts/hot-dev.sh > "$LOGFILE" 2>&1 &
+echo $! > "$PIDFILE"
+
+echo "Pulse dev server starting... (PID: $(cat $PIDFILE))"
+echo "Logs: tail -f $LOGFILE"
+echo "Frontend will be available at http://localhost:7655"