feat(printers): page native de gestion des imprimantes (cups_rs + CUPS CLI)

Nouvelle page Imprimantes: liste et etat des files CUPS, ajout (decouverte lpinfo, pilote driverless IPP Everywhere par defaut), suppression, imprimante par defaut, suspension/reprise, page de test et file des travaux avec annulation. Lectures via cups_rs (FFI libcups serialisee), mutations via lpadmin/cupsenable. i18n en/fr, sous-commande 'cosmic-settings printers'.

i18n/en/cosmic_settings.ftl

@@ -642,6 +642,50 @@ sound-usb-audio = USB Audio
 # Profiles for sound card devices
 sound-device-profiles = Device profiles
 
+# Printers settings page
+printers = Printers
+xdg-entry-printers-comment = Manage printers and print jobs
+printers-add = Add printer
+printers-add-in-progress = Adding printer…
+printers-added = Printer “{ $name }” added
+printers-cancel-job = Cancel job
+printers-default = Default
+printers-details = Printer details
+printers-device = Device
+printers-device-uri = Device URI
+printers-driver = Driver
+printers-error = Operation failed: { $error }
+printers-job-aborted = Aborted
+printers-job-canceled = Canceled
+printers-job-completed = Completed
+printers-job-held = Held
+printers-job-pending = Pending
+printers-job-processing = Printing
+printers-job-stopped = Stopped
+printers-job-unknown = Unknown
+printers-jobs = Print jobs
+printers-loading = Searching for devices…
+printers-location = Location
+printers-make-default = Set as default
+printers-name = Name
+printers-no-devices = No devices found
+printers-no-matching-drivers = No matching drivers
+printers-no-printers = No printers configured
+printers-not-accepting = Not accepting jobs
+printers-pause = Pause
+printers-remove = Remove printer
+printers-remove-confirm = Remove this printer?
+printers-remove-confirm-description = “{ $name }” will be removed from this system. Print jobs queued on it will be discarded.
+printers-resume = Resume
+printers-state = State
+printers-state-idle = Idle
+printers-state-processing = Printing
+printers-state-reasons = State reasons
+printers-state-stopped = Paused
+printers-state-unknown = Unknown
+printers-submit = Add
+printers-test-page = Print test page
+
 # Power & Battery settings page
 power = Power & battery