fix(api,web): movie delete always removes files

Drop the delete_files choice: removing a movie now always unlinks
its §7.4 library folder. Removes the query flag from DELETE
/api/movies/{id} and the OpenAPI params, and the toggle from the UI
confirmation panel — the confirmation itself stays. Path-safety and
torrent-untouched behaviour are unchanged.

Closes #110

web/src/style.css

@@ -854,65 +854,12 @@ body {
   box-shadow: inset 0 1px var(--highlight);
 }
 
-/* armed is a state, so it is amber and it is also a word: the toggle reads
-   "on" with all colour removed */
+/* armed is a state, not a toggle: it is amber whenever files are on disk to
+   delete */
 .remove-body[data-armed="true"] {
   border-color: oklch(from var(--signal-warn) l c h / 55%);
 }
 
-/* a control, not a form field: it stops at its own label */
-.remove-files {
-  display: flex;
-  align-items: center;
-  justify-self: start;
-  max-width: 100%;
-  gap: var(--space-3);
-  min-height: 2.75rem;
-  padding: 0 var(--space-3);
-  font: inherit;
-  font-size: var(--text-sm);
-  text-align: left;
-  color: var(--ink);
-  background: var(--panel-raised);
-  border: 1px solid var(--line);
-  border-radius: var(--radius);
-  box-shadow: inset 0 1px var(--highlight);
-  cursor: pointer;
-  transition:
-    border-color 150ms var(--ease-out),
-    color 150ms var(--ease-out);
-}
-
-.remove-files:hover:not(:disabled) {
-  border-color: var(--line-strong);
-}
-
-.remove-files:disabled {
-  color: var(--ink-faint);
-  cursor: default;
-}
-
-.remove-files-name {
-  flex: 1;
-  min-width: 0;
-}
-
-.remove-files-word {
-  flex: none;
-  font-size: var(--text-xs);
-  text-transform: uppercase;
-  letter-spacing: 0.08em;
-  color: var(--ink-faint);
-}
-
-.remove-files[aria-pressed="true"] {
-  border-color: oklch(from var(--signal-warn) l c h / 55%);
-}
-
-.remove-files[aria-pressed="true"] .remove-files-word {
-  color: var(--signal-warn);
-}
-
 .remove-evidence,
 .remove-path,
 .remove-note {