chore: remove dead apps/worker and apps/desktop stub modules

Both were scaffolding placeholders from Epic 14 (2c459da) that were never
built out: each was just an `application` build.gradle (clikt only, no
internal deps) and a one-line `println` Main.kt. Nothing depended on them —
no project(...) reference anywhere, only the settings.gradle includes, and no
script/doc/CI launched their MainKt — so they only cost build time configuring
two inert modules.

Delete both module dirs and drop their include lines from settings.gradle.
`./gradlew projects` now lists only :apps:cli and :apps:server (configures
clean).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/worker/build.gradle

@@ -1,14 +0,0 @@
-plugins {
-    id 'org.jetbrains.kotlin.jvm'
-    id 'application'
-}
-
-application {
-    mainClass = 'com.correx.apps.worker.MainKt'
-}
-
-dependencies {
-    implementation "com.github.ajalt.clikt:clikt:5.0.1"
-}
-
-tasks.named("koverVerify").configure { enabled = false }

apps/worker/src/main/kotlin/com/correx/apps/worker/Main.kt

@@ -1,5 +0,0 @@
-package com.correx.apps.worker
-
-fun main() {
-    println("correx :: apps/worker")
-}