🔦 Fix flashlight beam not tracking view pitch

The light was positioned once at toggle time and then handed to the engine
via SetParent + SetParentAttachmentMaintainOffset on the pawn's
`axis_of_intent` attachment. That attachment carries the body's yaw but not
the view pitch, so once parented the beam could only ever rotate
horizontally — looking up or down did nothing.

Drop the parenting and drive the light's transform ourselves every tick from
the pawn's live AbsOrigin and V_angle, which is how the plugin behaved before
0.1.1 replaced the per-tick teleport with a parented entity.

Also:
- OnTick no longer short-circuits on !AllowUseKey, which otherwise stopped
  the light updating for servers that only expose css_fl_toggle.
- ForwardDistance now offsets the light horizontally only. Applying it along
  the pitched forward vector put the light below ground when looking straight
  down (crouched eye height 46 minus 54).
- Sweep up the light when the pawn is dead; an un-parented entity no longer
  dies with its pawn.
- Remove the now-unused AttachmentName config key.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Flashlight/FlashlightConfig.cs

@@ -71,9 +71,6 @@ public class FlashlightConfig : BasePluginConfig
     [JsonPropertyName("CrouchEyeOffsetZ")]
     public float CrouchEyeOffsetZ { get; set; } = 46f;
 
-    [JsonPropertyName("AttachmentName")]
-    public string AttachmentName { get; set; } = "axis_of_intent";
-
     [JsonPropertyName("LightCookie")]
     public string LightCookie { get; set; } = "materials/effects/lightcookies/flashlight.vtex";
 
@@ -94,11 +91,6 @@ public class FlashlightConfig : BasePluginConfig
         StandEyeOffsetZ = Math.Max(0f, StandEyeOffsetZ);
         CrouchEyeOffsetZ = Math.Max(0f, CrouchEyeOffsetZ);
 
-        if (string.IsNullOrWhiteSpace(AttachmentName))
-        {
-            AttachmentName = "axis_of_intent";
-        }
-
         if (string.IsNullOrWhiteSpace(LightCookie))
         {
             LightCookie = "materials/effects/lightcookies/flashlight.vtex";