usernames: operator reserved-username blocklist

A plain blocklist for names like @support - separate from the collectible
system, so a reservation has no owner, no price and no "bought on Fragment"
badge.

- reserved_usernames table + migration.
- Enforced in replacePeerUsernameTx (the single editable-username write point:
  account.updateUsername, channels.updateUsername, @BotFather /setusername) and
  in the collectible mint path; a reserved name returns USERNAME_OCCUPIED.
- admin.Service: ReserveUsername / UnreserveUsername (journalled commands) and
  the ReservedUsernames listing.
- adminapi: /v1/reserved-usernames{,/reserve,/unreserve}.
- telesrv-admin panel + a "Reserved Usernames" page in the web UI (dist rebuilt).
- Postgres and in-memory store implementations; the memory registry gains an
  optional reserved-name check so tests exercise the same rule.

internal/store/memory/collectible_username.go

@@ -55,6 +55,24 @@ type CollectibleUsernameStore struct {
 	transfers map[int64][]domain.CollectibleUsernameTransfer
 	// commands maps a provenance command key onto the asset it touched.
 	commands map[string]int64
+	// reserved, when set, is the operator blocklist consulted before a name is
+	// assigned to an editable slot or minted, mirroring the PostgreSQL checks.
+	reserved *ReservedUsernameStore
+}
+
+// WithReservedUsernames wires the operator blocklist into the registry so a
+// reserved name is refused, matching PostgreSQL.
+func (s *CollectibleUsernameStore) WithReservedUsernames(reserved *ReservedUsernameStore) *CollectibleUsernameStore {
+	s.reserved = reserved
+	return s
+}
+
+func (s *CollectibleUsernameStore) nameReservedLocked(usernameLower string) bool {
+	if s.reserved == nil {
+		return false
+	}
+	r, _ := s.reserved.IsReserved(context.Background(), usernameLower)
+	return r
 }
 
 // collectibleRegistryRow is one peer_usernames row: the owning peer plus the
@@ -101,6 +119,9 @@ func (s *CollectibleUsernameStore) SetEditableUsername(_ context.Context, peer d
 		return false, domain.ErrUsernameInvalid
 	}
 	key := strings.ToLower(username)
+	if s.nameReservedLocked(key) {
+		return false, domain.ErrUsernameOccupied
+	}
 	if existing, ok := s.registry[key]; ok {
 		if existing.peer == peer && existing.row.Editable {
 			if existing.row.Username == username {
@@ -313,6 +334,9 @@ func (s *CollectibleUsernameStore) MintCollectibleUsername(_ context.Context, re
 	if _, ok := s.registry[key]; ok {
 		return domain.CollectibleUsername{}, false, domain.ErrUsernameOccupied
 	}
+	if s.nameReservedLocked(key) {
+		return domain.CollectibleUsername{}, false, domain.ErrUsernameOccupied
+	}
 	now := time.Now().UTC()
 	purchaseDate := req.PurchaseDate
 	if purchaseDate.IsZero() {

internal/store/memory/reserved_username.go

@@ -0,0 +1,100 @@
+package memory
+
+import (
+	"context"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+
+	"telesrv/internal/domain"
+)
+
+// ReservedUsernameStore is the in-memory operator username blocklist.
+type ReservedUsernameStore struct {
+	mu      sync.Mutex
+	entries map[string]domain.ReservedUsername // keyed by username_lower
+}
+
+// NewReservedUsernameStore creates an empty blocklist.
+func NewReservedUsernameStore() *ReservedUsernameStore {
+	return &ReservedUsernameStore{entries: make(map[string]domain.ReservedUsername)}
+}
+
+func (s *ReservedUsernameStore) IsReserved(_ context.Context, usernameLower string) (bool, error) {
+	if s == nil {
+		return false, nil
+	}
+	usernameLower = strings.ToLower(strings.TrimSpace(usernameLower))
+	if usernameLower == "" {
+		return false, nil
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	_, ok := s.entries[usernameLower]
+	return ok, nil
+}
+
+func (s *ReservedUsernameStore) ReserveUsername(_ context.Context, username, reason, actor string) (bool, error) {
+	username = strings.TrimSpace(username)
+	lower := strings.ToLower(username)
+	if lower == "" {
+		return false, domain.ErrUsernameInvalid
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if _, ok := s.entries[lower]; ok {
+		return false, nil
+	}
+	s.entries[lower] = domain.ReservedUsername{Username: username, Reason: reason, Actor: actor, CreatedAt: time.Now().UTC()}
+	return true, nil
+}
+
+func (s *ReservedUsernameStore) UnreserveUsername(_ context.Context, username string) (bool, error) {
+	lower := strings.ToLower(strings.TrimSpace(username))
+	if lower == "" {
+		return false, domain.ErrUsernameInvalid
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if _, ok := s.entries[lower]; !ok {
+		return false, nil
+	}
+	delete(s.entries, lower)
+	return true, nil
+}
+
+func (s *ReservedUsernameStore) ReservedUsernames(_ context.Context, filter domain.ReservedUsernameFilter) ([]domain.ReservedUsername, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	q := strings.ToLower(strings.TrimSpace(filter.Query))
+	out := make([]domain.ReservedUsername, 0, len(s.entries))
+	for key, entry := range s.entries {
+		if q != "" && !strings.HasPrefix(key, q) {
+			continue
+		}
+		out = append(out, entry)
+	}
+	sort.Slice(out, func(i, j int) bool {
+		if !out[i].CreatedAt.Equal(out[j].CreatedAt) {
+			return out[i].CreatedAt.After(out[j].CreatedAt)
+		}
+		return strings.ToLower(out[i].Username) < strings.ToLower(out[j].Username)
+	})
+	limit := filter.Limit
+	if limit <= 0 || limit > 500 {
+		limit = 100
+	}
+	offset := filter.Offset
+	if offset < 0 {
+		offset = 0
+	}
+	if offset >= len(out) {
+		return []domain.ReservedUsername{}, nil
+	}
+	end := offset + limit
+	if end > len(out) {
+		end = len(out)
+	}
+	return out[offset:end], nil
+}