Add patient personalization: profile saved once, reused every chat turn

packages/api-client/src/auth.ts

@@ -1,4 +1,9 @@
-import type { AuthUser, LoginRequest } from "@duoc-thu/shared-types";
+import type {
+  AuthUser,
+  LoginRequest,
+  PatientProfile,
+  PatientProfileUpdate,
+} from "@duoc-thu/shared-types";
 
 export class AuthError extends Error {
   constructor(readonly status: number) {
@@ -34,3 +39,23 @@ export async function me(): Promise<AuthUser | null> {
   if (!response.ok) throw new AuthError(response.status);
   return (await response.json()) as AuthUser;
 }
+
+/** Returns `null` on 401, same "not logged in is not an error" rule as `me`. */
+export async function getPatientProfile(): Promise<PatientProfile | null> {
+  const response = await fetch("/api/patient-profile");
+  if (response.status === 401) return null;
+  if (!response.ok) throw new AuthError(response.status);
+  return (await response.json()) as PatientProfile;
+}
+
+export async function savePatientProfile(
+  update: PatientProfileUpdate
+): Promise<PatientProfile> {
+  const response = await fetch("/api/patient-profile", {
+    method: "PUT",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(update),
+  });
+  if (!response.ok) throw new AuthError(response.status);
+  return (await response.json()) as PatientProfile;
+}

packages/shared-types/src/dto/auth.ts

@@ -23,3 +23,17 @@ export interface RegisterRequest {
   username: string;
   password: string;
 }
+
+/** Per-user clinical context, set once from the account profile page and
+ * reused across chat turns so a logged-in doctor isn't re-asked age/weight
+ * on every dosing question. All fields optional/nullable — an anonymous
+ * user or a logged-in user with no saved profile is entirely unaffected. */
+export interface PatientProfile {
+  ageText: string | null;
+  weightKg: number | null;
+  renalFunction: string | null;
+  hepaticFunction: string | null;
+  knownAllergies: string | null;
+}
+
+export type PatientProfileUpdate = Partial<PatientProfile>;