chore(deps): upgrade to request migration v2

[subomi]

Summary

Upgrades requestmigrations from v0.4.0 to v2, switching from handler-based migrations to type-based migrations.

Key Changes

• Type-based migrations: Migrations are now registered per type (e.g., models.CreateEndpoint, models.EndpointResponse) rather than per handler
• New API: Handlers use h.Versioning.For(r) to get a Migrator, then call migrator.Unmarshal() / migrator.Marshal()
• Runtime type detection: The library now detects concrete types in interface{} fields at runtime, enabling migrations to work correctly for PagedResponse.Content containing []EndpointResponse
• Context propagation: Migration methods now receive context.Context for proper request scoping

Files Changed

• api/handlers/handlers.go - Renamed RM to Versioning field
• api/handlers/endpoint.go - Updated all handlers to use new v2 API
• api/handlers/portal_link.go - Updated handlers to use new v2 API
• api/api.go - Renamed rm to versioning field
• api/migrations/*.go - Refactored migrations to implement TypeMigration interface with context.Context
• go.mod - Upgrades requestmigrations to v2.1.0

Migration Behavior Preserved

• v20240101: http_timeout and rate_limit_duration string↔uint64 conversion, advanced_signatures default
• v20240401: url↔target_url and name↔title field renames
• v20251124: owner_id validation for portal links

Test Plan

• All migration unit tests pass (go test -v ./api/migrations/...)
• Project builds successfully
• Manual testing of versioned API requests

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Note

Upgrades request versioning to requestmigrations v2 and refactors API to type-based migrations with per-type registration and new marshal/unmarshal flow.

• Replace github.com/subomi/requestmigrations with v2; wire versioning into routers/handlers and rename RM→Versioning
• Handlers for endpoints and portal links now use Versioning.For(r) + migrator.Unmarshal/Marshal; adjust request body reading and wrap migrated payload in ServerResponse.Data
• Introduce RegisterMigrations using generic Register[T] for CreateEndpoint, UpdateEndpoint, EndpointResponse, and portal link requests; remove legacy handler-oriented migrations
• Implement context-aware, type-based migrations for 2024-01-01 (duration conversions, default advanced_signatures), 2024-04-01 (field renames), 2025-11-24 (portal link owner_id validation) with unit tests
• go.mod updates: add new deps (e.g., minio, testcontainers modules), remove fatih/structs, bump to requestmigrations/v2

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