fix(playout): strip comments from casparcg.config (parser aborts on them)

CasparCG 2.4.0's config parser aborts at startup (SIGABRT, exit 134) on
nearly every launch when the config contains XML comments / blank lines.
Proven empirically: identical image + comment-free config = 8/8 stable
starts; + commented config = 0/8 (all abort before logging init). Use
the compact comment-free form that the known-good image shipped.

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

services/playout/casparcg.config

@@ -6,11 +6,6 @@
     <data-path>/media/casparcg/data/</data-path>
     <template-path>/media/templates/</template-path>
   </paths>
-
-  <!-- Single logical channel. The output consumer (DeckLink / NDI / SRT / RTMP)
-       is added at runtime over AMCP by the Node shim (playout-manager.js), so no
-       static consumer is declared here. A screen consumer is intentionally
-       omitted — this is a headless server. -->
   <channels>
     <channel>
       <video-mode>1080i5994</video-mode>
@@ -18,9 +13,7 @@
       </consumers>
     </channel>
   </channels>
-
   <controllers>
-    <!-- AMCP over TCP — the Node shim connects here. -->
     <tcp>
       <port>5250</port>
       <protocol>AMCP</protocol>