Remove Programs tab and all supporting code

The Programs feature is superseded by Shows, which provides a more
flexible model with schedule slots. This commit removes all Programs
code across frontend and backend:

Frontend:
- Delete admin-program-form component (ts/html/scss)
- Delete program.service.ts and program.ts interface
- Remove Programs tab, form modal, and all CRUD logic from admin
  component (ts + html)

Backend:
- Delete programs API router
- Remove Program ORM model and ProgramCreate/Update/Response schemas
- Remove programs router registration from main.py
- Remove Program from seed data, seed helpers, and truncate/reset

src/app/admin/admin.component.html

@@ -2,7 +2,7 @@
   <div class="container">
     <div class="admin-header">
       <h1>Admin Dashboard</h1>
-      <p>Manage shows, programs, events, tiers, history, team, and community content</p>
+      <p>Manage shows, events, tiers, history, team, and community content</p>
     </div>
 
     <!-- Tabs -->
@@ -12,11 +12,6 @@
         [class.active]="activeTab() === 'shows'"
         (click)="activeTab.set('shows')"
       >Shows</button>
-      <button
-        class="tab-btn"
-        [class.active]="activeTab() === 'programs'"
-        (click)="activeTab.set('programs')"
-      >Programs</button>
       <button
         class="tab-btn"
         [class.active]="activeTab() === 'events'"
@@ -95,48 +90,6 @@
       }
     }
 
-    <!-- Programs Tab -->
-    @if (activeTab() === 'programs') {
-      @if (programs$ | async; as programs) {
-        <div class="tab-content">
-          <div class="tab-toolbar">
-            <h2>Programs ({{ programs.length }})</h2>
-            <button class="btn btn-add" (click)="openProgramForm()">+ Add Program</button>
-          </div>
-
-          <table class="admin-table">
-            <thead>
-              <tr>
-                <th>Day</th>
-                <th>Time</th>
-                <th>Title</th>
-                <th>Host</th>
-                <th>Genre</th>
-                <th>Actions</th>
-              </tr>
-            </thead>
-            <tbody>
-              @for (program of programs; track program.id) {
-                <tr>
-                  <td>{{ program.day_label }}</td>
-                  <td>{{ program.time }}</td>
-                  <td>{{ program.title }}</td>
-                  <td>{{ program.host }}</td>
-                  <td>{{ program.genre }}</td>
-                  <td class="actions">
-                    <button class="btn-icon btn-edit" (click)="editProgram(program)">Edit</button>
-                    <button class="btn-icon btn-delete" (click)="deleteProgram(program.id)">Delete</button>
-                  </td>
-                </tr>
-              } @empty {
-                <tr><td colspan="6" class="empty-row">No programs yet. Click "Add Program" to create one.</td></tr>
-              }
-            </tbody>
-          </table>
-        </div>
-      }
-    }
-
     <!-- Events Tab -->
     @if (activeTab() === 'events') {
       @if (events$ | async; as events) {
@@ -393,9 +346,6 @@
   @if (showShowForm) {
     <app-admin-show-form [editItem]="editingShow" (saved)="onShowSaved()" (closed)="onShowClosed()" />
   }
-  @if (showProgramForm) {
-    <app-admin-program-form [editItem]="editingProgram" (saved)="onProgramSaved()" (closed)="onProgramClosed()" />
-  }
   @if (showEventForm) {
     <app-admin-event-form [editItem]="editingEvent" (saved)="onEventSaved()" (closed)="onEventClosed()" />
   }