feat: maintenance banner, activities log, pinned note, event templates, weekly summary cron

Maintenance mode banner:
- App layout reads SystemConfig maintenance_mode at server render time
- Amber sticky banner for regular users, dimmed indicator for superadmin

Baby activities (3 new event types):
- BATH (Bath icon, sky, timer+duration)
- WALK / Balade (Footprints icon, lime)
- TUMMY_TIME (Baby icon, amber)
- Added to EventType enum, EVENT_CONFIG, event-icon.tsx, dashboard quick-log

Pinned family note:
- Shared across all family members, shown at top of dashboard
- Inline edit with author + timestamp; /api/family/pinned-note GET/PATCH
- pinnedNote + pinnedNoteUpdatedAt + pinnedNoteAuthor fields on Family model

Event templates:
- Named quick-log presets per family (type + label + metadata)
- Dashboard row: tap to open pre-filled EventModal; hover ✕ to delete
- Dropdown to create new template; /api/event-templates GET/POST + /[id] PATCH/DELETE
- EventTemplate model in schema

Weekly summary cron:
- POST /api/cron/weekly-summary — auth via Bearer cron_secret (SystemConfig or env)
- Per family, per baby: feeds count, sleep total+avg, diaper count, latest weight
- Sends Pushover to all family members with pushoverUserKey
- Optional body.familyId to target one family

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

src/lib/event-config.ts

@@ -7,7 +7,10 @@ export type EventType =
   | "NAP"
   | "NIGHT_SLEEP"
   | "MEDICATION"
-  | "TEMPERATURE";
+  | "TEMPERATURE"
+  | "BATH"
+  | "WALK"
+  | "TUMMY_TIME";
 
 export const EVENT_CONFIG: Record<
   EventType,
@@ -112,6 +115,36 @@ export const EVENT_CONFIG: Record<
     hasDuration: false,
     hasTimer: false,
   },
+  BATH: {
+    label: "Bain",
+    icon: "Bath",
+    color: "#0284c7",
+    colorClass: "text-sky-600",
+    bgClass: "bg-sky-50",
+    borderClass: "border-sky-200",
+    hasDuration: true,
+    hasTimer: true,
+  },
+  WALK: {
+    label: "Balade",
+    icon: "Footprints",
+    color: "#65a30d",
+    colorClass: "text-lime-600",
+    bgClass: "bg-lime-50",
+    borderClass: "border-lime-200",
+    hasDuration: true,
+    hasTimer: true,
+  },
+  TUMMY_TIME: {
+    label: "Tummy time",
+    icon: "Baby",
+    color: "#d97706",
+    colorClass: "text-amber-600",
+    bgClass: "bg-amber-50",
+    borderClass: "border-amber-200",
+    hasDuration: true,
+    hasTimer: true,
+  },
 };
 
 export const ALL_EVENT_TYPES = Object.keys(EVENT_CONFIG) as EventType[];