implement server plugin system

server/plugin-system/discovery.js

@@ -0,0 +1,74 @@
+const fs = require("fs");
+const path = require("path");
+
+function discoverPlugins(pluginsDir) {
+  const discovered = new Map();
+
+  let entries;
+
+  try {
+    entries = fs.readdirSync(pluginsDir, { withFileTypes: true });
+  } catch {
+    return discovered;
+  }
+
+  for (const entry of entries) {
+    if (!entry.isDirectory() || entry.name.startsWith(".")) {
+      continue;
+    }
+
+    const pluginPath = path.join(pluginsDir, entry.name);
+    const indexPath = path.join(pluginPath, "index.js");
+
+    if (!fs.existsSync(indexPath)) {
+      continue;
+    }
+
+    let plugin;
+
+    try {
+      plugin = require(indexPath);
+    } catch (e) {
+      console.warn(`[plugins] Failed to load ${entry.name}: ${e.message}`);
+      continue;
+    }
+
+    if (!plugin.id || !plugin.name || typeof plugin.register !== "function") {
+      console.warn(
+        `[plugins] Skipping ${entry.name}: missing id, name, or register`,
+      );
+      continue;
+    }
+
+    let bundledPluginId = null;
+
+    if (plugin.obsidianPlugin) {
+      try {
+        const manifest = JSON.parse(
+          fs.readFileSync(
+            path.join(plugin.obsidianPlugin, "manifest.json"),
+            "utf-8",
+          ),
+        );
+        bundledPluginId = manifest.id;
+      } catch {
+        // No valid bundled plugin manifest
+      }
+    }
+
+    discovered.set(plugin.id, {
+      id: plugin.id,
+      name: plugin.name,
+      description: plugin.description || "",
+      obsidianPlugin: plugin.obsidianPlugin || null,
+      bundledPluginId,
+      module: plugin,
+    });
+
+    console.log(`[plugins] Discovered: ${plugin.name}`);
+  }
+
+  return discovered;
+}
+
+module.exports = { discoverPlugins };