Creataed all features

.gitignore

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+node_modules/
+dist/
+build/
+.env
+*.log

api/index.js

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+const app = require("../backend/src/app");
+
+module.exports = app;

backend/.env.example

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+MONGO_URI=mongodb://127.0.0.1:27017/vi_notes
+JWT_SECRET=replace_with_a_secure_secret
+CLIENT_ORIGIN=http://localhost:5173
+PORT=5000

backend/models/Session.js

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+const mongoose = require("mongoose");
+
+const SessionSchema = new mongoose.Schema({
+  text: String,
+  events: Array,
+  analysis: {
+    label: String,
+    confidence: Number,
+    avgInterval: Number,
+    pauseCount: Number,
+    backspaceCount: Number,
+    pasteCount: Number
+  },
+  userId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "User"
+  },
+  createdAt: { type: Date, default: Date.now }
+});
+
+module.exports = mongoose.model("Session", SessionSchema);

backend/models/User.js

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+const mongoose = require("mongoose");
+
+const UserSchema = new mongoose.Schema({
+  email: {
+    type: String,
+    required: true,
+    unique: true
+  },
+  password: {
+    type: String,
+    required: true
+  }
+});
+
+module.exports = mongoose.model("User", UserSchema);