feat: configurable stop grace period for applications

Adds stop_grace_period to application settings (seconds, 1-3600, default 30).
Used in place of the hardcoded docker stop -t 30 in the four places that
stop application containers: rolling update shutdown, manual stop, stop on
another server, and preview deployment stop.

Non-positive values fall back to the default via ($val > 0) ? $val : default,
with tests covering 0 and -10 so the cast does not blow up if a bad value
ever lands in the db.

Picks up Jack Coy's work from #7125 which went dormant. His commits are
squashed here with credit below.

Co-authored-by: Jack Coy <jackman3000@gmail.com>

resources/views/livewire/project/application/advanced.blade.php

@@ -86,7 +86,21 @@
                     helper="Readonly labels are disabled. You need to set the labels in the labels section." disabled
                     instantSave id="isStripprefixEnabled" label="Strip Prefixes" canGate="update" :canResource="$application" />
             @endif
-
+            <h3 class="pt-4">Operations</h3>
+            <form class="flex items-end gap-2" wire:submit.prevent='saveStopGracePeriod'>
+                <x-forms.input
+                    type="number"
+                    id="stopGracePeriod"
+                    label="Stop Grace Period (seconds)"
+                    placeholder="{{ DEFAULT_STOP_GRACE_PERIOD_SECONDS }}"
+                    helper="How long to wait for graceful shutdown during rolling updates, manual stops, and restarts. Applies to all containers for this application. Default: {{ DEFAULT_STOP_GRACE_PERIOD_SECONDS }} seconds. Range: 1-3600 seconds (1 hour)."
+                    min="1"
+                    max="3600"
+                    canGate="update"
+                    :canResource="$application"
+                />
+                <x-forms.button canGate="update" :canResource="$application" type="submit">Save</x-forms.button>
+            </form>
             <h3 class="pt-4">Logs</h3>
             <x-forms.checkbox helper="Drain logs to your configured log drain endpoint in your Server settings."
                 instantSave id="isLogDrainEnabled" label="Drain Logs" canGate="update" :canResource="$application" />