feat: enhance init command with auto-fill, smart file handling, and custom DinD support

- Add auto-fill for custom Docker images during reconfiguration
- Implement smart init.secure.sh handling with user prompts
- Simplify init.secure.sh template
- Add support for custom Docker-in-Docker images
- Rename init scripts for consistency (init-project.sh -> init.sh, secure.init.sh -> init.secure.sh)

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

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

Author: alexsteeel

.devcontainer/.gitignore

@@ -9,4 +9,4 @@ docker-compose.base.yaml
 
 # Project configuration (generated by init-project)
 ai-sbx.yaml
-secure.init.sh
+init.secure.sh

.devcontainer/CLAUDE.md

@@ -18,7 +18,7 @@ cp .env.example .env
 # Edit .env as needed
 
 # Initialize (first time only)
-./init-project.sh /path/to/your-project
+./init.sh /path/to/your-project
 
 # Start services
 docker compose up -d
@@ -30,7 +30,7 @@ The devcontainer can also be started using the DevContainer CLI:
 devcontainer up --workspace-folder .
 ```
 
-**Note**: The `init-project.sh` script accepts the project directory as an argument, which is automatically passed by `devcontainer.json` during initialization.
+**Note**: The `init.sh` script accepts the project directory as an argument, which is automatically passed by `devcontainer.json` during initialization.
 
 ## Configuration Files
 
@@ -126,7 +126,7 @@ One-time setup script that performs critical host setup:
 
 Run once per project:
 ```bash
-./init-project.sh /absolute/path/to/project
+./init.sh /absolute/path/to/project
 ```
 
 This script MUST be run before starting the devcontainer to ensure proper permissions.

.devcontainer/devcontainer.json

@@ -6,7 +6,7 @@
   "shutdownAction": "stopCompose",
   "containerUser": "claude",
   "updateRemoteUserUID": false,
-  "initializeCommand": ".devcontainer/init-project.sh \"${localWorkspaceFolder}\"",
+  "initializeCommand": ".devcontainer/init.sh \"${localWorkspaceFolder}\"",
   "postCreateCommand": "/home/claude/scripts/non-root-post-create.sh",
   "containerEnv": {
     "TERM": "xterm-256color",

.devcontainer/secure.init.sh .devcontainer/init.secure.sh.devcontainer/secure.init.sh renamed to .devcontainer/init.secure.sh

@@ -3,10 +3,10 @@
 # This file contains credentials and sensitive data - NEVER commit to git!
 #
 # To use:
-# 1. Copy this file to secure.init.sh
+# 1. Copy this file to init.secure.sh
 # 2. Add your credentials and sensitive configuration
 # 3. The file will be automatically copied to new worktrees
-# 4. secure.init.sh is in .gitignore and won't be committed
+# 4. init.secure.sh is in .gitignore and won't be committed
 
 echo "Running secure initialization..."