feat: Add APP_NAME env support for branding and deployment

- Make app name configurable via APP_NAME env variable - Update UI,
HTML, Docker, scripts, and k8s to use APP_NAME - Add process-html.sh for
template substitution - Document APP_NAME usage in
docs/APP_NAME_CONFIGURATION.md - Update Dockerfile, compose, and scripts
for dynamic naming - Add index.html.template for environment-based
branding

vite.config.ts

@@ -7,6 +7,9 @@ export default defineConfig(({ mode }) => {
     define: {
       'process.env.API_KEY': JSON.stringify(env.GEMINI_API_KEY),
       'process.env.GEMINI_API_KEY': JSON.stringify(env.GEMINI_API_KEY),
+      'import.meta.env.VITE_APP_NAME': JSON.stringify(
+        env.APP_NAME || 'RxMinder'
+      ),
     },
     resolve: {
       alias: {