Change load_dotenv() to load_dotenv(override=False) so real environment
variables always take priority over stale .env files. This prevents a
hardcoded or outdated REDMINE_API_KEY in .env from silently overriding
a fresh token exported in the shell (#15).
Add .strip() to get_redmine_password() for consistency with all other
config getters — trailing whitespace in .env no longer causes silent
auth failures (#35).
Closes#15, closes#35
