shmilylty/OneForAll ? reverse-engineered prompt

Build me a Python tool that helps me collect subdomains for a domain or a list of domains, then checks which ones are real and which ones are alive. I want it to run from the command line, be easy to use, and save the results into files like CSV or JSON, plus a database file so I can review everything later.

It should support scanning one domain or many domains at once, do DNS lookups, basic HTTP checks, optional subdomain brute forcing, and a simple check for possible subdomain takeover risks. Please make it fast and reliable, and organize the code so the different parts are easy to run on their own too.

Add clear help text, sensible defaults, and a way to point it at a custom config file for API keys or proxy settings if needed. If you need to look up current docs online for any libraries, go ahead. Also include a Dockerfile so I can run it without much setup.