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>

skills-lock.json

@@ -19,6 +19,12 @@
       "skillPath": "security/SKILL.md",
       "computedHash": "5717187bba9c22030c7174c74012f01c359f21e2ce87e0eb80e24244d8b8c915"
     },
+    "bklit-ui": {
+      "source": "bklit/bklit-ui",
+      "sourceType": "github",
+      "skillPath": "skills/bklit-ui/SKILL.md",
+      "computedHash": "ace89f8b9a6d5d8f0367307f886cb9654065356db537df7b57b3d849aa503534"
+    },
     "coss": {
       "source": "cosscom/coss",
       "sourceType": "github",
@@ -53,7 +59,7 @@
       "source": "shadcn/ui",
       "sourceType": "github",
       "skillPath": "skills/shadcn/SKILL.md",
-      "computedHash": "80a6226e78f6d1fe464214ae0ef449d49d8ffaa3e7704f011e9b418c678ad4d1"
+      "computedHash": "ac9d0d69caac7de1d1e5647f3db3bcd2f13af355d6b3a78780fbf7fc80e8dca0"
     },
     "two-factor-authentication-best-practices": {
       "source": "better-auth/skills",