docs: native enum rs_type = "Enum" breaking change in 2.0

[lethib]

PR Info

• Closes SeaQL/sea-orm#3104
• Dependencies:
  • N/A
• Dependents:
  • N/A

New Features

• N/A

Bug Fixes

• N/A

Breaking Changes

• Documents a breaking change introduced in SeaORM 2.0: native database enums now use rs_type = "Enum" instead of rs_type = "String". The ActiveEnum::Value associated type is now sea_query::Enum (carrying the enum type name as metadata) rather than String, which changes the signatures of to_value (now returns sea_query::Enum) and try_from_value (now expects &sea_query::Enum). String-backed (rs_type = "String") and integer-backed (rs_type = "i32") enums are unaffected. This is a docs-only PR describing that change.

Changes

• 04-generate-entity/04-enumeration.md (the ActiveEnum page): update the Native Database Enum examples to rs_type = "Enum", and add a Since 2.0.0 note explaining the new sea_query::Enum value type, its struct shape, and how to convert to/from String.
• 09-schema-statement/02-create-enum.md: update the Native Database Enum example to rs_type = "Enum" and cross-link to the ActiveEnum page.