fix(provider): stop advertising unimplemented nip04 and getRelays

window.nostr.nip04 delegated to a background handler that throws "not
implemented", and getRelays returned {}. Feature-detection
(window.nostr.nip04 / .getRelays) was therefore lying to callers. NIP-04 is a
distinct, deprecated scheme we do not implement (Podkey ships NIP-44 v2 only),
and Podkey holds no relay list, so the honest signal is the absence of both
methods. The dead background cases are removed alongside the NIP-98 work.

Co-Authored-By: jjohare <github@thedreamlab.uk>

Author: jjohare

src/nostr-provider.js

@@ -57,37 +57,10 @@
       });
     },
 
-    /**
-     * Get relays (optional NIP-07 extension)
-     * @returns {Promise<object>} Relay configuration
-     */
-    async getRelays () {
-      return sendMessageToExtension({ type: 'GET_RELAYS' });
-    },
-
-    /**
-     * Encrypt (NIP-04)
-     * @param {string} pubkey - Recipient public key
-     * @param {string} plaintext - Message to encrypt
-     * @returns {Promise<string>} Encrypted message
-     */
-    nip04: {
-      encrypt: async (pubkey, plaintext) => {
-        return sendMessageToExtension({
-          type: 'NIP04_ENCRYPT',
-          pubkey,
-          plaintext
-        });
-      },
-
-      decrypt: async (pubkey, ciphertext) => {
-        return sendMessageToExtension({
-          type: 'NIP04_DECRYPT',
-          pubkey,
-          ciphertext
-        });
-      }
-    },
+    // NIP-04 is intentionally not provided: it is a deprecated, unauthenticated
+    // scheme and Podkey only ships NIP-44 (v2). Advertising window.nostr.nip04
+    // would make feature-detection lie. NIP-07 getRelays is also omitted because
+    // Podkey holds no relay list — a missing method is the honest signal.
 
     /**
      * Encrypt / decrypt (NIP-44 v2)