🎨 优化扩展模块，完成ai接入和对话功能

data/st-core-scripts/scripts/extensions/tts/css/minimax-tts.css

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+.minimax_tts_settings>.tts_block {
+    gap: 5px;
+    margin: 5px 0;
+}
+
+.minimax-custom-item {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 8px;
+    background: #333;
+    margin: 5px 0;
+    border-radius: 4px;
+}
+
+.minimax-custom-item-info {
+    display: flex;
+    flex-direction: column;
+}
+
+.minimax-custom-item-name {
+    font-weight: bold;
+}
+
+.minimax-custom-item-details {
+    color: #aaa;
+    font-size: 0.9em;
+}
+
+.minimax-custom-item-remove {
+    padding: 4px 8px;
+    font-size: 12px;
+}
+
+.minimax-empty-list {
+    color: #888;
+    font-style: italic;
+}

data/st-core-scripts/scripts/extensions/tts/css/openai-tts.css

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+#openai-character-instructions {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+}
+
+#openai-character-instructions .character-instructions {
+    display: flex;
+    flex-direction: column;
+    gap: 5px;
+}