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/src/db/schema/email-settings.ts

@@ -0,0 +1,19 @@
+import { pgTable, text, timestamp } from "drizzle-orm/pg-core";
+
+// Deployment-wide email-provider configuration — a single row (id = "default").
+// Email (verification, password reset, invitations) is sent while the user is
+// logged out / before any clinic exists, so this can't be per-clinic; it's one
+// config for the whole deployment, set by any clinic admin from Settings →
+// Developers. The provider's API key is stored encrypted (lib/crypto.ts).
+export const emailSettings = pgTable("email_settings", {
+  id: text("id").primaryKey().default("default"),
+  // "none" | "smtp" | "resend" | "postmark" | "sendgrid"
+  provider: text("provider").notNull().default("none"),
+  fromAddress: text("from_address").notNull().default(""),
+  // Encrypted API key (Resend/Postmark/SendGrid). SMTP uses env credentials.
+  credentials: text("credentials"),
+  updatedAt: timestamp("updated_at")
+    .defaultNow()
+    .$onUpdate(() => new Date())
+    .notNull(),
+});

backend/src/db/schema/index.ts

@@ -11,6 +11,7 @@ export * from "./activity.js";
 export * from "./messaging.js";
 export * from "./notifications.js";
 export * from "./settings.js";
+export * from "./email-settings.js";
 export * from "./ai.js";
 export * from "./ai-chat.js";
 export * from "./org-ai-policy.js";