implement event persistence and improve Mongoose TypeScript patterns

- Add event persistence: confirmed events are now saved to MongoDB
- Refactor Mongoose models to use virtuals for id field with IdVirtual interface
- Update repositories to use toJSON() with consistent type casting
- Add more test responses for chat (doctor, birthday, gym, etc.)
- Show event description in ProposedEventCard
- Change mongo-express port to 8083
- Update CLAUDE.md with Mongoose model pattern documentation

apps/server/src/repositories/mongo/models/ChatModel.ts

@@ -1,8 +1,13 @@
-import mongoose, { Schema, Document } from 'mongoose';
+import mongoose, { Schema, Document, Model } from 'mongoose';
 import { ChatMessage, Conversation, CreateEventDTO, UpdateEventDTO, ProposedEventChange } from '@caldav/shared';
+import { IdVirtual } from './types';
 
-export interface ChatMessageDocument extends Omit<ChatMessage, 'id'>, Document {}
-export interface ConversationDocument extends Omit<Conversation, 'id'>, Document {}
+export interface ChatMessageDocument extends Omit<ChatMessage, 'id'>, Document {
+  toJSON(): ChatMessage;
+}
+export interface ConversationDocument extends Omit<Conversation, 'id'>, Document {
+  toJSON(): Conversation;
+}
 
 const EventSchema = new Schema<CreateEventDTO>(
   {
@@ -40,7 +45,7 @@ const ProposedChangeSchema = new Schema<ProposedEventChange>(
   { _id: false }
 );
 
-const ChatMessageSchema = new Schema<ChatMessageDocument>(
+const ChatMessageSchema = new Schema<ChatMessageDocument, Model<ChatMessageDocument, {}, {}, IdVirtual>, {}, {}, IdVirtual>(
   {
     conversationId: {
       type: String,
@@ -61,9 +66,16 @@ const ChatMessageSchema = new Schema<ChatMessageDocument>(
   },
   {
     timestamps: true,
+    virtuals: {
+      id: {
+        get() {
+          return this._id.toString();
+        },
+      },
+    },
     toJSON: {
+      virtuals: true,
       transform: (_, ret: Record<string, unknown>) => {
-        ret.id = String(ret._id);
         delete ret._id;
         delete ret.__v;
         return ret;
@@ -72,7 +84,7 @@ const ChatMessageSchema = new Schema<ChatMessageDocument>(
   }
 );
 
-const ConversationSchema = new Schema<ConversationDocument>(
+const ConversationSchema = new Schema<ConversationDocument, Model<ConversationDocument, {}, {}, IdVirtual>, {}, {}, IdVirtual>(
   {
     userId: {
       type: String,
@@ -82,9 +94,16 @@ const ConversationSchema = new Schema<ConversationDocument>(
   },
   {
     timestamps: true,
+    virtuals: {
+      id: {
+        get() {
+          return this._id.toString();
+        },
+      },
+    },
     toJSON: {
+      virtuals: true,
       transform: (_, ret: Record<string, unknown>) => {
-        ret.id = String(ret._id);
         delete ret._id;
         delete ret.__v;
         return ret;