No-DB build: hide/remove the Options menu (build-aware)

The Options menu (options.html + yc_options) manages the user's email and
password - account settings that only persist with a database. Without one
the menu is non-persistent and misleading (a guest who sets a password can't
log back in after being garbage-collected, since the recycled-user login
checks the password). Make it build-aware (#ifdef DATABASE):

- html/input.html: the Options link is now %%OPTIONS_LINK%%.
- src/reqp.cpp: set map_params[OPTIONS_LINK] to the link (built with the
  session tmpid) under #ifdef DATABASE, else empty. So a DB build keeps the
  Options link; the no-DB build hides it.
- Dockerfile (no-DB build): drop options.html and yc_options.so from the
  image (the popup form and the options module are gone; an on-demand
  get_module for the options event fails gracefully -> no-op).

Verified (no-DB): the input frame no longer shows an Options link (Colors,
Help, Users, Logout remain); options.html -> 'Page not found';
yc_options.so absent; normal chat still works.

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