Extract Vue frontend into separate container and add stp_wasm crate

Move Vue app from nginx/vue/ to top-level vue/ with its own Dockerfile,
update docker-compose configs and nginx proxy to serve from the new
container, and add initial Rust WASM crate (stp_wasm). Also fix .gitignore
to exclude Rust target/ directories.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vue/src/components/util/VideoTable.vue

@@ -0,0 +1,30 @@
+<script setup>
+import { computed } from "vue";
+
+const props = defineProps({
+    sourceArr: {
+        type: Array,
+        required: true,
+    },
+});
+
+function sourceType(link) {
+    return "video/" + link.split(".").pop();
+}
+
+const keys = ["name", "link"];
+</script>
+
+<template>
+    <video
+        v-for="(source, rowIndex) in sourceArr"
+        :key="rowIndex"
+        class="bdr-1"
+        width="300"
+        height="400"
+        controls
+        preload="none"
+    >
+        <source :src="source.link" :type="sourceType(source.link)" />
+    </video>
+</template>