Add themes, static assets, and logo

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

themes/vanilla-js/theme.json

@@ -0,0 +1,56 @@
+{
+  "template_id": "vanilla-js-theme",
+  "template_path": "./themes/vanilla-js",
+  "template_type": "card",
+  "data_schema": "../../schemas/post_schema.json",
+  "required_fields": [
+    "platform",
+    "id",
+    "title",
+    "author",
+    "timestamp",
+    "score",
+    "replies",
+    "url"
+  ],
+  "optional_fields": [
+    "content",
+    "source",
+    "tags",
+    "meta"
+  ],
+  "css_dependencies": [
+    "./themes/vanilla-js/styles.css"
+  ],
+  "js_dependencies": [
+    "./themes/vanilla-js/renderer.js"
+  ],
+  "templates": {
+    "card": "./themes/vanilla-js/card-template.html",
+    "list": "./themes/vanilla-js/list-template.html",
+    "detail": "./themes/vanilla-js/detail-template.html",
+    "comment": "./themes/vanilla-js/comment-template.html"
+  },
+  "render_options": {
+    "container_selector": "#posts-container",
+    "batch_size": 50,
+    "lazy_load": true,
+    "animate": true
+  },
+  "filters": {
+    "platform": true,
+    "date_range": true,
+    "score_threshold": true,
+    "source": true
+  },
+  "sorting": {
+    "default_field": "timestamp",
+    "default_order": "desc",
+    "available_fields": [
+      "timestamp",
+      "score",
+      "replies",
+      "title"
+    ]
+  }
+}