chore(chat): clean up legacy state machine and fix bubble alignment

- Remove redundant `loadingMoreHistory` and `ready` states from chat machine, consolidating history loading flow
- Add `align-self: flex-start` to chat row container for proper alignment
- Clean up commented-out margin rules in text bubble styles
- Update deploy script GIT_REMOTE from "server" to "test"

src/app/chat/components/chat-area.module.css

@@ -39,6 +39,7 @@
   display: flex;
   flex-direction: row;
   align-items: flex-start;
+  align-self: flex-start;
   gap: var(--spacing-1, 4px);
 }
 

src/app/chat/components/text-bubble.module.css

@@ -17,8 +17,6 @@
   background: #fff;
   color: var(--color-text-foreground, #000);
   border-top-left-radius: 0;
-  /* 气泡在头像侧的外侧留白 */
-  /* margin-left: var(--spacing-4, 16px); */
 }
 
 .bubbleUser {
@@ -29,6 +27,4 @@
   );
   color: #fff;
   border-top-right-radius: 0;
-  /* 气泡在头像侧的外侧留白 */
-  /* margin-right: var(--spacing-4, 16px); */
 }