feat: email provider, admin password reset, portal new-patient, chat pill

Chat: history pill now shows a History icon + a Start-new-chat (SquarePen)
button; removed the duplicate chat-history list from the sidebar.

Email: deployment-wide email provider config (Resend/Postmark/SendGrid/SMTP) in
Settings → Developers, with encrypted API key and a Send-test action. sendEmail
dispatches via the chosen provider (REST via fetch; SMTP via nodemailer).

Forgot password with no provider: alert the clinic admin(s) via a "System"
message card in Messages + a bell notification (seeded system user + per-clinic
System conversation); clicking deep-links to /settings?tab=careTeam&member=<id>.
Admins can set a member's password directly from the employee dialog
(PATCH /api/staff/:id/password via Better Auth's internal context — no admin
plugin needed).

Patient Portal: "New patient" booking path registers a demographics-only patient
then books; bookings reject double-booked slots (409).

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

backend/drizzle/0027_romantic_kylun.sql

@@ -0,0 +1,7 @@
+CREATE TABLE "email_settings" (
+	"id" text PRIMARY KEY DEFAULT 'default' NOT NULL,
+	"provider" text DEFAULT 'none' NOT NULL,
+	"from_address" text DEFAULT '' NOT NULL,
+	"credentials" text,
+	"updated_at" timestamp DEFAULT now() NOT NULL
+);

backend/drizzle/meta/_journal.json

@@ -190,6 +190,13 @@
       "when": 1781969782874,
       "tag": "0026_many_wolfsbane",
       "breakpoints": true
+    },
+    {
+      "idx": 27,
+      "version": "7",
+      "when": 1781973588708,
+      "tag": "0027_romantic_kylun",
+      "breakpoints": true
     }
   ]
 }