sync env examples and add voyage dependency to readmes

Author: jordan-smith721

mflix/README-JAVA-SPRING.md

@@ -21,6 +21,8 @@ This is a full-stack movie browsing application built with Java Spring Boot and
 - **MongoDB Atlas cluster or local deployment** with the `sample_mflix` dataset loaded
   - [Load sample data](https://www.mongodb.com/docs/atlas/sample-data/) 
 - **Maven** (included via Maven Wrapper)
+- **Voyage AI API key** (For MongoDB Vector Search)
+  - [Get a Voyage AI API key](https://www.voyageai.com/)
 
 ## Getting Started
 

mflix/README-JAVASCRIPT-EXPRESS.md

@@ -20,6 +20,8 @@ This is a full-stack movie browsing application built with Express.js and Next.j
 - **MongoDB Atlas cluster or local deployment** with the `sample_mflix` dataset loaded
   - [Load sample data](https://www.mongodb.com/docs/atlas/sample-data/) 
 - **npm** (included with Node.js)
+- **Voyage AI API key** (For MongoDB Vector Search)
+  - [Get a Voyage AI API key](https://www.voyageai.com/)
 
 ## Getting Started
 

mflix/server/java-spring/.env.example

@@ -1,6 +1,6 @@
 # MongoDB Connection
 # Replace with your MongoDB Atlas connection string or local MongoDB URI
-MONGODB_URI=mongodb+srv://username:password@cluster.mongodb.net/?retryWrites=true&w=majority
+MONGODB_URI=mongodb+srv://<username>:<password>@<cluster>.mongodb.net/sample_mflix?retryWrites=true&w=majority
 
 # Voyage AI Configuration
 # API key for Voyage AI embedding model (required for Vector Search)

mflix/server/python-fastapi/.env.example

@@ -1,6 +1,6 @@
 # MongoDB Connection
 # Replace with your MongoDB Atlas connection string or local MongoDB URI
-MONGO_URI="mongodb://localhost:27017"
+MONGO_URI="mongodb+srv://<username>:<password>@<cluster>.mongodb.net/sample_mflix?retryWrites=true&w=majority"
 MONGO_DB="sample_mflix"
 
 # Voyage AI Configuration