feat: add merchant profile edit, keys dialog, and publish to Nostr

- Add PATCH endpoint for updating merchant profile config
- Add website field to MerchantProfile model
- Fix to_nostr_event to include all profile fields (display_name, banner, website, nip05, lud16)
- Always publish merchant profile (kind 0) when publishing to Nostr
- Extract edit-profile-dialog and nostr-keys-dialog into separate components
- Fix profile avatar alignment to match original design
- Simplify keys dialog to show only npub QR code (no nsec QR)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/components/nostr-keys-dialog.js

@@ -0,0 +1,56 @@
+window.app.component('nostr-keys-dialog', {
+  name: 'nostr-keys-dialog',
+  template: '#nostr-keys-dialog',
+  delimiters: ['${', '}'],
+  props: ['public-key', 'private-key', 'model-value'],
+  emits: ['update:model-value'],
+  data: function () {
+    return {
+      showNsec: false
+    }
+  },
+  computed: {
+    show: {
+      get() {
+        return this.modelValue
+      },
+      set(value) {
+        this.$emit('update:model-value', value)
+      }
+    },
+    npub: function () {
+      if (!this.publicKey) return ''
+      try {
+        return window.NostrTools.nip19.npubEncode(this.publicKey)
+      } catch (e) {
+        return this.publicKey
+      }
+    },
+    nsec: function () {
+      if (!this.privateKey) return ''
+      try {
+        return window.NostrTools.nip19.nsecEncode(this.privateKey)
+      } catch (e) {
+        return this.privateKey
+      }
+    }
+  },
+  methods: {
+    copyText: function (text, message) {
+      var notify = this.$q.notify
+      Quasar.copyToClipboard(text).then(function () {
+        notify({
+          message: message || 'Copied to clipboard!',
+          position: 'bottom'
+        })
+      })
+    }
+  },
+  watch: {
+    modelValue(newVal) {
+      if (!newVal) {
+        this.showNsec = false
+      }
+    }
+  }
+})