Add BASE_PATH environment variable for subfolder hosting support

Co-authored-by: nickshanks347 <11299982+nickshanks347@users.noreply.github.com>

Author: Copilot

.env.example

@@ -1,4 +1,5 @@
 SONARR_URL=
 RADARR_URL=
 SONARR_API_KEY=
-RADARR_API_KEY=
+RADARR_API_KEY=
+BASE_PATH=

README.md

@@ -25,8 +25,11 @@ The logic for the download speed is extremely inaccurate.
     SONARR_API_KEY=your-sonarr-api-key
     RADARR_URL=http://localhost:7878
     RADARR_API_KEY=your-radarr-api-key
+    BASE_PATH=
     ```
 
+    **Optional**: Set `BASE_PATH` to host monitarr on a subfolder (e.g., `BASE_PATH=/monitarr` to access at `http://localhost:3000/monitarr`). This is useful for reverse proxy setups where you want to host monitarr at `yourdomain.com/monitarr` instead of a subdomain.
+
 4. Run `yarn build`
 5. Run `yarn start`
 6. Visit `http://localhost:3000` in your browser
@@ -47,6 +50,7 @@ services:
       - SONARR_API_KEY=YOUR_SONARR_API_KEY
       - RADARR_URL=http://radarr:7878
       - RADARR_API_KEY=YOUR_RADARR_API_KEY
+      - BASE_PATH=/monitarr  # Optional: for subfolder hosting
     restart: unless-stopped
 ```
 

next.config.mjs

@@ -1,6 +1,7 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
     output: 'standalone',
+    basePath: process.env.BASE_PATH || '',
 };
 
 export default nextConfig;