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/confirmation-request.tsx

@@ -0,0 +1,54 @@
+"use client";
+
+import {
+  Confirmation,
+  ConfirmationAccepted,
+  ConfirmationAction,
+  ConfirmationActions,
+  ConfirmationRejected,
+  ConfirmationRequest,
+  ConfirmationTitle,
+} from "@/components/ai-elements/confirmation";
+import { CheckIcon, XIcon } from "lucide-react";
+import { nanoid } from "nanoid";
+
+const handleReject = () => {
+  // In production, call respondToConfirmationRequest with approved: false
+};
+
+const handleApprove = () => {
+  // In production, call respondToConfirmationRequest with approved: true
+};
+
+const Example = () => (
+  <div className="w-full max-w-2xl">
+    <Confirmation approval={{ id: nanoid() }} state="approval-requested">
+      <ConfirmationTitle>
+        <ConfirmationRequest>
+          This tool wants to execute a query on the production database:
+          <code className="mt-2 block rounded bg-muted p-2 text-sm">
+            SELECT * FROM users WHERE role = &apos;admin&apos;
+          </code>
+        </ConfirmationRequest>
+        <ConfirmationAccepted>
+          <CheckIcon className="size-4 text-green-600 dark:text-green-400" />
+          <span>You approved this tool execution</span>
+        </ConfirmationAccepted>
+        <ConfirmationRejected>
+          <XIcon className="size-4 text-destructive" />
+          <span>You rejected this tool execution</span>
+        </ConfirmationRejected>
+      </ConfirmationTitle>
+      <ConfirmationActions>
+        <ConfirmationAction onClick={handleReject} variant="outline">
+          Reject
+        </ConfirmationAction>
+        <ConfirmationAction onClick={handleApprove} variant="default">
+          Approve
+        </ConfirmationAction>
+      </ConfirmationActions>
+    </Confirmation>
+  </div>
+);
+
+export default Example;