Add Tor hidden service support and fallback relay profile fetching (v0.46.0)

- Add pkg/tor package for Tor hidden service integration
- Add Tor config options: ORLY_TOR_ENABLED, ORLY_TOR_PORT, ORLY_TOR_HS_DIR, ORLY_TOR_ONION_ADDRESS
- Extend NIP-11 relay info with addresses field for .onion URLs
- Add fallback relays (Damus, nos.lol, nostr.band, purplepag.es) for profile lookups
- Refactor profile fetching to try local relay first, then fallback relays
- Add Tor setup documentation and deployment scripts

Files modified:
- app/config/config.go: Add Tor configuration options
- app/handle-relayinfo.go: Add ExtendedRelayInfo with addresses field
- app/main.go: Initialize and manage Tor service lifecycle
- app/server.go: Add torService field to Server struct
- app/web/src/constants.js: Add FALLBACK_RELAYS
- app/web/src/nostr.js: Add fallback relay profile fetching
- pkg/tor/: New package for Tor hidden service management
- docs/TOR_SETUP.md: Documentation for Tor configuration
- deploy/orly-tor.service: Systemd service for Tor integration
- scripts/tor-*.sh: Setup scripts for Tor development and production

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

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

pkg/tor/hostname.go

@@ -0,0 +1,116 @@
+package tor
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"lol.mleku.dev/chk"
+	"lol.mleku.dev/log"
+)
+
+// HostnameWatcher watches the Tor hidden service hostname file for changes.
+// When Tor creates or updates a hidden service, it writes the .onion address
+// to a file called "hostname" in the HiddenServiceDir.
+type HostnameWatcher struct {
+	hsDir    string
+	address  string
+	onChange func(string)
+
+	stopCh chan struct{}
+	mu     sync.RWMutex
+}
+
+// NewHostnameWatcher creates a new hostname watcher for the given HiddenServiceDir.
+func NewHostnameWatcher(hsDir string) *HostnameWatcher {
+	return &HostnameWatcher{
+		hsDir:  hsDir,
+		stopCh: make(chan struct{}),
+	}
+}
+
+// OnChange sets a callback function to be called when the hostname changes.
+func (w *HostnameWatcher) OnChange(fn func(string)) {
+	w.mu.Lock()
+	w.onChange = fn
+	w.mu.Unlock()
+}
+
+// Start begins watching the hostname file.
+func (w *HostnameWatcher) Start() error {
+	// Try to read immediately
+	if err := w.readHostname(); err != nil {
+		log.D.F("hostname file not yet available: %v", err)
+	}
+
+	// Start polling goroutine
+	go w.poll()
+
+	return nil
+}
+
+// Stop stops the hostname watcher.
+func (w *HostnameWatcher) Stop() {
+	close(w.stopCh)
+}
+
+// Address returns the current .onion address.
+func (w *HostnameWatcher) Address() string {
+	w.mu.RLock()
+	defer w.mu.RUnlock()
+	return w.address
+}
+
+// poll periodically checks the hostname file for changes.
+func (w *HostnameWatcher) poll() {
+	ticker := time.NewTicker(5 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-w.stopCh:
+			return
+		case <-ticker.C:
+			if err := w.readHostname(); err != nil {
+				// Only log at trace level to avoid spam
+				log.T.F("hostname read: %v", err)
+			}
+		}
+	}
+}
+
+// readHostname reads the hostname file and updates the address if changed.
+func (w *HostnameWatcher) readHostname() error {
+	path := filepath.Join(w.hsDir, "hostname")
+
+	data, err := os.ReadFile(path)
+	if chk.T(err) {
+		return err
+	}
+
+	// Parse the address (file contains "xyz.onion\n")
+	addr := strings.TrimSpace(string(data))
+	if addr == "" {
+		return nil
+	}
+
+	w.mu.Lock()
+	oldAddr := w.address
+	w.address = addr
+	onChange := w.onChange
+	w.mu.Unlock()
+
+	// Call callback if address changed
+	if addr != oldAddr && onChange != nil {
+		onChange(addr)
+	}
+
+	return nil
+}
+
+// HostnameFilePath returns the path to the hostname file.
+func (w *HostnameWatcher) HostnameFilePath() string {
+	return filepath.Join(w.hsDir, "hostname")
+}