feat(curses): add compact startup and scale controls

[Komzpa]

Fixes #227.
Fixes #549.
Supersedes #584.
Supersedes #602.

Credit note: #227 by Giovanni Giacobbi provided the original fixed-scale stripchart experiment. This PR turns that direction into an explicit configurable --scale option, so it is not a direct cherry-pick.

Stack note: this branch is now kept on top of the newer related stack because maintainers have been merging newest-to-oldest. --report-on-exit was split out to #643, so this PR now carries only compact startup and stripchart scale controls.

Summary

• add --compact to start the curses UI in compact layout
• add --scale to select fixed stripchart latency thresholds
• document the options and include them in bash completion
• hide/reject the curses-only long options in builds configured without curses support

Validation

• composite newest-to-oldest stack merge through csv: omit trailing empty header field #575: clean
• ./bootstrap.sh && ./configure --without-gtk --without-jansson && make -j$(nproc) on the composite stack
• git diff --check on the composite stack
• make check TESTS='format-count-test test/cmdparse.py test/probe.py test/param.py test/dist-version.sh' on the composite stack: format-count-test, test/cmdparse.py, and test/dist-version.sh passed; test/probe.py/test/param.py need root/network support and failed in the unprivileged run with socket/route errors
• sudo python3 ./test/cmdparse.py on the composite stack: passed