Add Morning Routine to Admin and TV greeting state

Adds a per-user Morning Routine item list that appears in the TV
dashboard Activities panel during the "Good Morning" countdown
(before the first block starts).

- morning_routine_items table (auto-created on startup)
- CRUD API at /api/morning-routine (auth-required)
- Items included in the public DashboardSnapshot so TV gets them
  without auth
- Morning Routine section in Admin page (same add/edit/delete UX
  as subject options)
- TV Activities column shows routine items when no block is active,
  switches to subject options once a block starts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/views/TVView.vue

@@ -59,22 +59,32 @@
         </div>
       </div>
 
-      <!-- Center: subject options -->
-      <div class="tv-options-col" :style="{ background: currentSubjectColor + '22', borderColor: currentSubjectColor }">
+      <!-- Center: subject options or morning routine -->
+      <div
+        class="tv-options-col"
+        :style="scheduleStore.currentBlock
+          ? { background: currentSubjectColor + '22', borderColor: currentSubjectColor }
+          : { background: '#1e293b', borderColor: '#334155' }"
+      >
         <div class="tv-options-title">Activities</div>
-        <div
-          v-if="currentSubjectOptions.length"
-          class="tv-options-list"
-        >
-          <div
-            v-for="opt in currentSubjectOptions"
-            :key="opt.id"
-            class="tv-option-item"
-          >
-            {{ opt.text }}
+        <!-- Morning routine during greeting state -->
+        <template v-if="!scheduleStore.currentBlock">
+          <div v-if="scheduleStore.morningRoutine.length" class="tv-options-list">
+            <div v-for="(item, i) in scheduleStore.morningRoutine" :key="i" class="tv-option-item">
+              {{ item }}
+            </div>
           </div>
-        </div>
-        <div v-else class="tv-options-empty">No activities listed for this subject.</div>
+          <div v-else class="tv-options-empty">No morning routine items added yet.</div>
+        </template>
+        <!-- Subject options during active block -->
+        <template v-else>
+          <div v-if="currentSubjectOptions.length" class="tv-options-list">
+            <div v-for="opt in currentSubjectOptions" :key="opt.id" class="tv-option-item">
+              {{ opt.text }}
+            </div>
+          </div>
+          <div v-else class="tv-options-empty">No activities listed for this subject.</div>
+        </template>
       </div>
 
       <!-- Right: schedule list -->