feat: add Nostr channel plugin and onboarding install defaults

Co-authored-by: joelklabo <joelklabo@users.noreply.github.com>

extensions/nostr/index.ts

@@ -0,0 +1,69 @@
+import type { ClawdbotPluginApi, ClawdbotConfig } from "clawdbot/plugin-sdk";
+import { emptyPluginConfigSchema } from "clawdbot/plugin-sdk";
+
+import { nostrPlugin } from "./src/channel.js";
+import { setNostrRuntime, getNostrRuntime } from "./src/runtime.js";
+import { createNostrProfileHttpHandler } from "./src/nostr-profile-http.js";
+import { resolveNostrAccount } from "./src/types.js";
+import type { NostrProfile } from "./src/config-schema.js";
+
+const plugin = {
+  id: "nostr",
+  name: "Nostr",
+  description: "Nostr DM channel plugin via NIP-04",
+  configSchema: emptyPluginConfigSchema(),
+  register(api: ClawdbotPluginApi) {
+    setNostrRuntime(api.runtime);
+    api.registerChannel({ plugin: nostrPlugin });
+
+    // Register HTTP handler for profile management
+    const httpHandler = createNostrProfileHttpHandler({
+      getConfigProfile: (accountId: string) => {
+        const runtime = getNostrRuntime();
+        const cfg = runtime.config.loadConfig() as ClawdbotConfig;
+        const account = resolveNostrAccount({ cfg, accountId });
+        return account.profile;
+      },
+      updateConfigProfile: async (accountId: string, profile: NostrProfile) => {
+        const runtime = getNostrRuntime();
+        const cfg = runtime.config.loadConfig() as ClawdbotConfig;
+
+        // Build the config patch for channels.nostr.profile
+        const channels = (cfg.channels ?? {}) as Record<string, unknown>;
+        const nostrConfig = (channels.nostr ?? {}) as Record<string, unknown>;
+
+        const updatedNostrConfig = {
+          ...nostrConfig,
+          profile,
+        };
+
+        const updatedChannels = {
+          ...channels,
+          nostr: updatedNostrConfig,
+        };
+
+        await runtime.config.writeConfigFile({
+          ...cfg,
+          channels: updatedChannels,
+        });
+      },
+      getAccountInfo: (accountId: string) => {
+        const runtime = getNostrRuntime();
+        const cfg = runtime.config.loadConfig() as ClawdbotConfig;
+        const account = resolveNostrAccount({ cfg, accountId });
+        if (!account.configured || !account.publicKey) {
+          return null;
+        }
+        return {
+          pubkey: account.publicKey,
+          relays: account.relays,
+        };
+      },
+      log: api.logger,
+    });
+
+    api.registerHttpHandler(httpHandler);
+  },
+};
+
+export default plugin;