feat(display): add chairman speech page and refine layouts

This commit introduces a new page for the Chairman of the Board's speech and includes several visual refinements for the
event display.

- Add `speech/3.html` to display the chairman's video.
- Update the committee member list.
- Adjust font sizes, colors, and element positioning on the main and committee list pages for better visual
presentation.
- Fine-tune background video placement and scaling.

20251012/main/background.js

@@ -40,9 +40,9 @@
     // leftMargin: 0,
     // topOffset: -200,
     // scalePercent: 125
-    leftMargin: 600,
-    topOffset: -200,
-    scalePercent: 125,
+    leftMargin: 650,
+    topOffset: 0,
+    scalePercent: 100,
     rotationDeg: 0,
     opacityPercent: 100,
   };

20251012/main/index.html

@@ -50,21 +50,21 @@
 
       <!-- 标题 -->
       <h1
-        class="absolute top-4 text-center w-full font-bai-ge text-8xl text-yellow-300"
+        class="absolute top-4 text-center w-full font-bai-ge text-7xl text-yellow-300"
       >
         永平赵子龙庙
       </h1>
 
       <!-- 副标题描边层 -->
       <h2
-        class="absolute top-28 w-full text-center font-bai-ge text-6xl text-transparent [-webkit-text-stroke:4px_yellow]"
+        class="absolute top-28 w-full text-center font-bai-ge text-8xl text-transparent [-webkit-text-stroke:4px_white]"
       >
         庆祝赵子龙元帅暨众神圣诞千秋
       </h2>
 
       <!-- 副标题实色层 -->
       <h2
-        class="absolute top-28 text-center w-full font-bai-ge text-6xl text-red-500"
+        class="absolute top-28 text-center w-full font-bai-ge text-8xl text-red-500"
       >
         庆祝赵子龙元帅暨众神圣诞千秋
       </h2>
@@ -115,7 +115,7 @@
 
       <!-- Controls 面板（可关闭） -->
       <div
-        class="absolute right-2 top-2 w-[320px] bg-white p-2 rounded-md hidden"
+        class="absolute right-2 top-2 w-[320px] bg-white text-black p-2 rounded-md hidden"
         id="controlsPanel"
         role="region"
         aria-label="视频抠像控制面板"