Add NRC (Nostr Relay Connect) protocol and web UI (v0.48.9)

- Implement NIP-NRC protocol for remote relay access through public relay tunnel
- Add NRC bridge service with NIP-44 encrypted message tunneling
- Add NRC client library for applications
- Add session management with subscription tracking and expiry
- Add URI parsing for nostr+relayconnect:// scheme with secret and CAT auth
- Add NRC API endpoints for connection management (create/list/delete/get-uri)
- Add RelayConnectView.svelte component for managing NRC connections in web UI
- Add NRC database storage for connection secrets and labels
- Add NRC CLI commands (generate, list, revoke)
- Add support for Cashu Access Tokens (CAT) in NRC URIs
- Add ScopeNRC constant for Cashu token scope
- Add wasm build infrastructure and stub files

Files modified:
- app/config/config.go: NRC configuration options
- app/handle-nrc.go: New API handlers for NRC connections
- app/main.go: NRC bridge startup integration
- app/server.go: Register NRC API routes
- app/web/src/App.svelte: Add Relay Connect tab
- app/web/src/RelayConnectView.svelte: New NRC management component
- app/web/src/api.js: NRC API client functions
- main.go: NRC CLI command handlers
- pkg/bunker/acl_adapter.go: Add NRC scope mapping
- pkg/cashu/token/token.go: Add ScopeNRC constant
- pkg/database/nrc.go: NRC connection storage
- pkg/protocol/nrc/: New NRC protocol implementation
- docs/NIP-NRC.md: NIP specification document

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

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

pkg/database/unicode_normalize_wasm.go

@@ -0,0 +1,135 @@
+//go:build js && wasm
+
+package database
+
+// normalizeRune maps decorative unicode characters (small caps, fraktur) back to
+// their ASCII equivalents for consistent word indexing. This ensures that text
+// written with decorative alphabets (e.g., "ᴅᴇᴀᴛʜ" or "𝔇𝔢𝔞𝔱𝔥") indexes the same
+// as regular ASCII ("death").
+//
+// Character sets normalized:
+// - Small Caps (used for DEATH-style text in Terry Pratchett tradition)
+// - Mathematical Fraktur lowercase (𝔞-𝔷)
+// - Mathematical Fraktur uppercase (𝔄-ℨ, including Letterlike Symbols block exceptions)
+func normalizeRune(r rune) rune {
+	// Check small caps first (scattered codepoints)
+	if mapped, ok := smallCapsToASCII[r]; ok {
+		return mapped
+	}
+
+	// Check fraktur lowercase: U+1D51E to U+1D537 (contiguous range)
+	if r >= 0x1D51E && r <= 0x1D537 {
+		return 'a' + (r - 0x1D51E)
+	}
+
+	// Check fraktur uppercase main range: U+1D504 to U+1D51C (with gaps)
+	if r >= 0x1D504 && r <= 0x1D51C {
+		if mapped, ok := frakturUpperToASCII[r]; ok {
+			return mapped
+		}
+	}
+
+	// Check fraktur uppercase exceptions from Letterlike Symbols block
+	if mapped, ok := frakturLetterlikeToASCII[r]; ok {
+		return mapped
+	}
+
+	return r
+}
+
+// smallCapsToASCII maps small capital letters to lowercase ASCII.
+// These are scattered across multiple Unicode blocks (IPA Extensions,
+// Phonetic Extensions, Latin Extended-D).
+var smallCapsToASCII = map[rune]rune{
+	'ᴀ': 'a', // U+1D00 LATIN LETTER SMALL CAPITAL A
+	'ʙ': 'b', // U+0299 LATIN LETTER SMALL CAPITAL B
+	'ᴄ': 'c', // U+1D04 LATIN LETTER SMALL CAPITAL C
+	'ᴅ': 'd', // U+1D05 LATIN LETTER SMALL CAPITAL D
+	'ᴇ': 'e', // U+1D07 LATIN LETTER SMALL CAPITAL E
+	'ꜰ': 'f', // U+A730 LATIN LETTER SMALL CAPITAL F
+	'ɢ': 'g', // U+0262 LATIN LETTER SMALL CAPITAL G
+	'ʜ': 'h', // U+029C LATIN LETTER SMALL CAPITAL H
+	'ɪ': 'i', // U+026A LATIN LETTER SMALL CAPITAL I
+	'ᴊ': 'j', // U+1D0A LATIN LETTER SMALL CAPITAL J
+	'ᴋ': 'k', // U+1D0B LATIN LETTER SMALL CAPITAL K
+	'ʟ': 'l', // U+029F LATIN LETTER SMALL CAPITAL L
+	'ᴍ': 'm', // U+1D0D LATIN LETTER SMALL CAPITAL M
+	'ɴ': 'n', // U+0274 LATIN LETTER SMALL CAPITAL N
+	'ᴏ': 'o', // U+1D0F LATIN LETTER SMALL CAPITAL O
+	'ᴘ': 'p', // U+1D18 LATIN LETTER SMALL CAPITAL P
+	'ǫ': 'q', // U+01EB LATIN SMALL LETTER O WITH OGONEK (no true small cap Q)
+	'ʀ': 'r', // U+0280 LATIN LETTER SMALL CAPITAL R
+	'ꜱ': 's', // U+A731 LATIN LETTER SMALL CAPITAL S
+	'ᴛ': 't', // U+1D1B LATIN LETTER SMALL CAPITAL T
+	'ᴜ': 'u', // U+1D1C LATIN LETTER SMALL CAPITAL U
+	'ᴠ': 'v', // U+1D20 LATIN LETTER SMALL CAPITAL V
+	'ᴡ': 'w', // U+1D21 LATIN LETTER SMALL CAPITAL W
+	// Note: no small cap X exists in standard use
+	'ʏ': 'y', // U+028F LATIN LETTER SMALL CAPITAL Y
+	'ᴢ': 'z', // U+1D22 LATIN LETTER SMALL CAPITAL Z
+}
+
+// frakturUpperToASCII maps Mathematical Fraktur uppercase letters to lowercase ASCII.
+// The main range U+1D504-U+1D51C has gaps where C, H, I, R, Z use Letterlike Symbols.
+var frakturUpperToASCII = map[rune]rune{
+	'𝔄': 'a', // U+1D504 MATHEMATICAL FRAKTUR CAPITAL A
+	'𝔅': 'b', // U+1D505 MATHEMATICAL FRAKTUR CAPITAL B
+	// C is at U+212D (Letterlike Symbols)
+	'𝔇': 'd', // U+1D507 MATHEMATICAL FRAKTUR CAPITAL D
+	'𝔈': 'e', // U+1D508 MATHEMATICAL FRAKTUR CAPITAL E
+	'𝔉': 'f', // U+1D509 MATHEMATICAL FRAKTUR CAPITAL F
+	'𝔊': 'g', // U+1D50A MATHEMATICAL FRAKTUR CAPITAL G
+	// H is at U+210C (Letterlike Symbols)
+	// I is at U+2111 (Letterlike Symbols)
+	'𝔍': 'j', // U+1D50D MATHEMATICAL FRAKTUR CAPITAL J
+	'𝔎': 'k', // U+1D50E MATHEMATICAL FRAKTUR CAPITAL K
+	'𝔏': 'l', // U+1D50F MATHEMATICAL FRAKTUR CAPITAL L
+	'𝔐': 'm', // U+1D510 MATHEMATICAL FRAKTUR CAPITAL M
+	'𝔑': 'n', // U+1D511 MATHEMATICAL FRAKTUR CAPITAL N
+	'𝔒': 'o', // U+1D512 MATHEMATICAL FRAKTUR CAPITAL O
+	'𝔓': 'p', // U+1D513 MATHEMATICAL FRAKTUR CAPITAL P
+	'𝔔': 'q', // U+1D514 MATHEMATICAL FRAKTUR CAPITAL Q
+	// R is at U+211C (Letterlike Symbols)
+	'𝔖': 's', // U+1D516 MATHEMATICAL FRAKTUR CAPITAL S
+	'𝔗': 't', // U+1D517 MATHEMATICAL FRAKTUR CAPITAL T
+	'𝔘': 'u', // U+1D518 MATHEMATICAL FRAKTUR CAPITAL U
+	'𝔙': 'v', // U+1D519 MATHEMATICAL FRAKTUR CAPITAL V
+	'𝔚': 'w', // U+1D51A MATHEMATICAL FRAKTUR CAPITAL W
+	'𝔛': 'x', // U+1D51B MATHEMATICAL FRAKTUR CAPITAL X
+	'𝔜': 'y', // U+1D51C MATHEMATICAL FRAKTUR CAPITAL Y
+	// Z is at U+2128 (Letterlike Symbols)
+}
+
+// frakturLetterlikeToASCII maps the Fraktur characters that live in the
+// Letterlike Symbols block (U+2100-U+214F) rather than Mathematical Alphanumeric Symbols.
+var frakturLetterlikeToASCII = map[rune]rune{
+	'ℭ': 'c', // U+212D BLACK-LETTER CAPITAL C
+	'ℌ': 'h', // U+210C BLACK-LETTER CAPITAL H
+	'ℑ': 'i', // U+2111 BLACK-LETTER CAPITAL I
+	'ℜ': 'r', // U+211C BLACK-LETTER CAPITAL R
+	'ℨ': 'z', // U+2128 BLACK-LETTER CAPITAL Z
+}
+
+// hasDecorativeUnicode checks if text contains any small caps or fraktur characters
+// that would need normalization. Used by migration to identify events needing re-indexing.
+func hasDecorativeUnicode(s string) bool {
+	for _, r := range s {
+		// Check small caps
+		if _, ok := smallCapsToASCII[r]; ok {
+			return true
+		}
+		// Check fraktur lowercase range
+		if r >= 0x1D51E && r <= 0x1D537 {
+			return true
+		}
+		// Check fraktur uppercase range
+		if r >= 0x1D504 && r <= 0x1D51C {
+			return true
+		}
+		// Check letterlike symbols fraktur
+		if _, ok := frakturLetterlikeToASCII[r]; ok {
+			return true
+		}
+	}
+	return false
+}