DOCSP-55438 & DOCSP-55529: Unify .env vars and add new verification scripts for all three backends

[cbullinger]

1. Created self-contained requirements verification scripts for each backend
2. Standardized environment variables across all three backends
3. Updated README files with "Verify Requirements" instructions

ℹ️ NOTE: The scripts will NOT fully succeed when run in the monorepo unless you change the SERVER_DIR in each script's configuration section. They are written and intended to be run from the root of each respective artifact repo, so you'll need to update them to:

• server/js-express
• server/java-spring
• server/python-fastapi

[tmcneil-mdb]

Nice work!☀️

So this looks good to me but, we have a logical error in the order of the readme. At the top of the readmes, we are asking the user to verify the requirements, but this will always fail based on the script. The readme is walking the user through how to setup the environment, thus it would not pass until the user has gotten to the end.

You could move the verification to the end? Or perhaps break up the script?