Set up environment-based configurations for API and builds.

Replaced hardcoded API URLs with environment-specific configurations. Added new environments (development, beta, production) with respective settings. Updated build scripts and Angular file replacements to support environment-based builds.

frontend/build.gradle.kts

@@ -39,13 +39,13 @@ tasks.register("npmBuild") {
           "${it.absolutePath}/npm.cmd"
         } ?: "$nodeDir/node_modules/npm/bin/npm.cmd"
 
-        commandLine(npmCmd, "run", "build")
+        commandLine(npmCmd, "run", "build:dev")
       } else {
         val npmExecutable = file(nodeDir).listFiles()?.find { it.name.startsWith("npm") && it.isDirectory }?.let {
           "${it.absolutePath}/bin/npm"
         } ?: "$nodeDir/node_modules/npm/bin/npm"
 
-        commandLine(npmExecutable, "run", "build")
+        commandLine(npmExecutable, "run", "build:beta")
       }
     }
   }