Add emotes HTML page at /, health endpoint, Dockerfile, and Docker workflow

Agent-Logs-Url: https://github.com/Open3DLab/mikebase/sessions/349bd27e-61d5-40d4-b4d1-0c552a78a9e2

Co-authored-by: Ganonmaster <168445+Ganonmaster@users.noreply.github.com>

src/routes/emotes.rs

@@ -1,7 +1,7 @@
 use axum::{
     extract::{Multipart, Path, State},
     http::StatusCode,
-    response::{IntoResponse, Json},
+    response::{Html, IntoResponse, Json},
 };
 use serde_json::json;
 
@@ -11,9 +11,9 @@ use crate::{
 };
 
 /// GET /
-/// Returns a simple health-check message.
+/// Serves an HTML page that dynamically loads and displays emotes from /json.
 pub async fn root() -> impl IntoResponse {
-    Json(json!({"status": "ok", "message": "mikebase server is running"}))
+    Html(include_str!("../templates/index.html"))
 }
 
 /// GET /json