feat: AI-added records save with placeholders + "Added by AI" provenance

Stop blocking AI imports/proposals on missing non-critical fields. Records
the chat agent drafts now save with safe placeholders, auto-generated file
numbers, and a source="ai" marker that surfaces an "Added by AI" badge so a
clinician can review/edit them later.

Backend:
- add `source` (manual|ai) column to patients/appointments/prescriptions
  (migration 0014) + canonical types, services, validation schemas
- relax patient/appointment validation: empty file number allowed, demographic
  + type/provider/initials fall back to placeholders (initials derived from name)
- patients.generateFileNumber() auto-assigns an MRN when one is missing
- proposeAppointment accepts a name when no file number resolves; AI commits +
  /api/ai/import stamp source="ai"

Frontend:
- `source` on Appointment/Patient/Prescription types; AI commits send source="ai"
- reusable <AiBadge> shown on the Patients table/detail and prescriptions list

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.agents/skills/ai-elements/scripts/shimmer-elements.tsx

@@ -0,0 +1,43 @@
+"use client";
+
+import { Shimmer } from "@/components/ai-elements/shimmer";
+
+const Example = () => (
+  <div className="flex flex-col gap-6 p-8">
+    <div className="text-center">
+      <p className="mb-3 text-muted-foreground text-sm">
+        As paragraph (default)
+      </p>
+      <Shimmer as="p">This is rendered as a paragraph</Shimmer>
+    </div>
+
+    <div className="text-center">
+      <p className="mb-3 text-muted-foreground text-sm">As heading</p>
+      <Shimmer as="h2" className="font-bold text-2xl">
+        Large Heading with Shimmer
+      </Shimmer>
+    </div>
+
+    <div className="text-center">
+      <p className="mb-3 text-muted-foreground text-sm">As span (inline)</p>
+      <div>
+        Processing your request{" "}
+        <Shimmer as="span" className="inline">
+          with AI magic
+        </Shimmer>
+        ...
+      </div>
+    </div>
+
+    <div className="text-center">
+      <p className="mb-3 text-muted-foreground text-sm">
+        As div with custom styling
+      </p>
+      <Shimmer as="div" className="font-semibold text-lg">
+        Custom styled shimmer text
+      </Shimmer>
+    </div>
+  </div>
+);
+
+export default Example;