add Settings domain with DB persistence and admin CRUD API

[bitcoin-coder-bob]

closes #934

• Introduce a Settings domain model that moves 16 runtime-tunable config values (ban threshold/duration, exit delays, VTXO tree expiry, round participant limits, amount limits, etc.) out of environment
  variables and into the database
• Add SettingsRepository with implementations for Postgres, SQLite, and Badger, including SQL migrations
• Add three new Admin gRPC/REST endpoints: GetSettings, UpdateSettings, and ClearSettings
• On startup, seed default settings to the DB if none exist (scheduler-aware: block vs time-based defaults)
• Settings changes propagate live to the running app service via an UpdateSettings callback — no restart required
• Remove the corresponding env vars from config, docker-compose, and .env files

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between f90cc3e and 0c9a296.

⛔ Files ignored due to path filters (4)

• api-spec/protobuf/gen/ark/v1/admin.pb.go is excluded by !**/*.pb.go, !**/gen/**
• api-spec/protobuf/gen/ark/v1/admin.pb.rgw.go is excluded by !**/gen/**
• api-spec/protobuf/gen/ark/v1/admin_grpc.pb.go is excluded by !**/*.pb.go, !**/gen/**
• api-spec/protobuf/gen/ark/v1/indexer.pb.rgw.go is excluded by !**/gen/**

📒 Files selected for processing (34)

• Makefile
• README.md
• api-spec/openapi/swagger/ark/v1/admin.openapi.json
• api-spec/protobuf/ark/v1/admin.proto
• docker-compose.regtest.yml
• envs/arkd.dev.env
• envs/arkd.light.env
• internal/config/config.go
• internal/core/application/admin.go
• internal/core/application/admin_test.go
• internal/core/application/service.go
• internal/core/application/types.go
• internal/core/domain/settings.go
• internal/core/domain/settings_repo.go
• internal/core/ports/repo_manager.go
• internal/infrastructure/db/badger/settings_repo.go
• internal/infrastructure/db/postgres/migration/20260227000000_add_settings.down.sql
• internal/infrastructure/db/postgres/migration/20260227000000_add_settings.up.sql
• internal/infrastructure/db/postgres/settings_repo.go
• internal/infrastructure/db/postgres/sqlc/queries/models.go
• internal/infrastructure/db/postgres/sqlc/queries/query.sql.go
• internal/infrastructure/db/postgres/sqlc/query.sql
• internal/infrastructure/db/service.go
• internal/infrastructure/db/service_test.go
• internal/infrastructure/db/sqlite/migration/20260227000000_add_settings.down.sql
• internal/infrastructure/db/sqlite/migration/20260227000000_add_settings.up.sql
• internal/infrastructure/db/sqlite/settings_repo.go
• internal/infrastructure/db/sqlite/sqlc/queries/models.go
• internal/infrastructure/db/sqlite/sqlc/queries/query.sql.go
• internal/infrastructure/db/sqlite/sqlc/query.sql
• internal/interface/grpc/handlers/adminservice.go
• internal/interface/grpc/permissions/permissions.go
• internal/test/e2e/single_batch_smoke_test.go
• internal/test/e2e/utils_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bob/settings-domain-and-repo

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