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feat: add counterfactual-safes CGW module for backend persistence (#3011)

Add a new counterfactual-safes module that persists counterfactual Safe data
server-side, replacing frontend localStorage. Includes:

- TypeORM entity with unique constraint on (chainId, address)
- Repository with create, find, findOrFail, delete operations
- Auth-guarded REST endpoints (POST/GET/DELETE /v1/users/counterfactual-safes)
- Space-scoped read endpoint (GET /v1/spaces/:spaceId/counterfactual-safes)
- Auth-agnostic user resolution via getAuthenticatedUserIdOrFail (supports both SiWE and email/OIDC)
- Zod validation schemas with hex/address validation
- Address checksumming via databaseAddressTransformer
- E2E controller tests and repository integration tests

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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