Cache system detection across module runs for instant launches

Removed subshell isolation that was unsetting SYS_ variables before each
module run. This caused full system re-detection (~530ms) every time a
module launched from the menu.

Changes:
- Removed: Subshell + SYS_ variable unsetting (lines 63-68)
- Now: Direct module execution with cached detection

Benefits:
- Module launches: ~530ms faster (instant after first detection)
- No redundant detection on every menu selection
- Detection only runs once per toolkit session
- Modules still get fresh detection if they explicitly call detect functions

Result: Modules now launch instantly instead of having 0.5s delay

launcher.sh

@@ -60,12 +60,9 @@ run_module() {
     echo -e "${CYAN}Launching: $category/$module${NC}"
     echo -e "${CYAN}──────────────────────────────────────────────────────────────${NC}"
 
-    (
-        for var in $(compgen -e | grep "^SYS_"); do
-            unset "$var"
-        done
-        "$MODULES_DIR/$category/$module" "$@"
-    )
+    # Run module directly - keep SYS_ variables cached for performance
+    # Modules will use cached detection instead of re-detecting on every run
+    "$MODULES_DIR/$category/$module" "$@"
     local exit_code=$?
 
     echo ""