refactor(loyalty): remove the dead customer points and tokens code

First part of PC-601 (docs/prd-point-coin.md §10.7): the code that has
had no way in since balances moved to the wallet.

- The /marketing/customer-points and /marketing/customer-tokens routes
  were commented out; their 16 handler methods, the GamificationService
  methods behind them, and the validators, transformers, mappers and
  contract/model types only they used are gone.
- CustomerPointsProcessor loses its "not implemented" stubs; it keeps the
  customer app's balance, wallet and games endpoints.
- CustomerTokensProcessor and the customer points and tokens repositories,
  wired but no longer called by anything, are gone.

What stays until its preconditions are met: the customer_points and
customer_tokens tables and their entities, which cmd/wallet-migrate still
reads, and the /customer/points, /customer/tokens aliases and the
token_used / tokens_remaining fields, until the apps no longer use them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/models/customer_tokens.go

@@ -1,44 +0,0 @@
-package models
-
-import (
-	"time"
-
-	"github.com/google/uuid"
-)
-
-type CreateCustomerTokensRequest struct {
-	CustomerID uuid.UUID `json:"customer_id" validate:"required"`
-	TokenType  string    `json:"token_type" validate:"required,oneof=SPIN RAFFLE MINIGAME"`
-	Balance    int64     `json:"balance" validate:"min=0"`
-}
-
-type UpdateCustomerTokensRequest struct {
-	Balance int64 `json:"balance" validate:"min=0"`
-}
-
-type AddCustomerTokensRequest struct {
-	Tokens int64 `json:"tokens" validate:"required,min=1"`
-}
-
-type DeductCustomerTokensRequest struct {
-	Tokens int64 `json:"tokens" validate:"required,min=1"`
-}
-
-type CustomerTokensResponse struct {
-	ID         uuid.UUID         `json:"id"`
-	CustomerID uuid.UUID         `json:"customer_id"`
-	TokenType  string            `json:"token_type"`
-	Balance    int64             `json:"balance"`
-	Customer   *CustomerResponse `json:"customer,omitempty"`
-	CreatedAt  time.Time         `json:"created_at"`
-	UpdatedAt  time.Time         `json:"updated_at"`
-}
-
-type ListCustomerTokensQuery struct {
-	Page      int    `query:"page" validate:"min=1"`
-	Limit     int    `query:"limit" validate:"min=1,max=100"`
-	Search    string `query:"search"`
-	TokenType string `query:"token_type" validate:"omitempty,oneof=SPIN RAFFLE MINIGAME"`
-	SortBy    string `query:"sort_by" validate:"omitempty,oneof=balance token_type created_at updated_at"`
-	SortOrder string `query:"sort_order" validate:"omitempty,oneof=asc desc"`
-}