Fix CC2r: uncheck not persisting + want_license hiding cc2r when active

Issue 1 — hidden seeds overriding user input:
Removed all hidden seed inputs (cc2r, want_license, license_id,
license_custom). The .licence-license-choice div is now rendered
directly from $formData on page load instead of via HTMX load
trigger. This eliminates stale-seed interference on both HTMX
radio changes and full form submits.

Issue 2 — Interne want_license uncheck clearing CC2r:
When want_license is unchecked, CC2r and licence selections are
cleared (section hidden). Added hidden want_license=0 so the
fragment handler can distinguish "arriving from another access
type" (no want_license in POST → preserve values) from "explicit
Interne toggle" (want_license present → clear CC2r if off).

CC2r is independently toggleable within the visible section.
Licence dropdown placeholder changed to 'Aucune licence' for
an explicit no-licence choice.

TODO.md

@@ -20,3 +20,4 @@
 - [x] Replace <details> with <fieldset>/<legend> in cleanup fragments (like contenus.php)
 - [x] Standardise test group recipes: lint-php, lint-css, lint-js, test + add fix recipe + make lint pass clean
 - [x] Remove Mot de passe column from acces.php, add key.svg icon button in Actions to copy password to clipboard, reorder actions (URL/password/edit/toggle/archive), switch URL icon to link-simple.svg
+- [x] Fix CC2r: removed hidden seeds (were stale/overriding user input), render initial licence-choice from \$formData; Interne want_license unchecked clears CC2r+licence, switching from other modes preserves values; CC2r independent toggle; licence dropdown has no-licence placeholder