v2 token endpoints

[LucHeart]

No description provided.

[Copilot]

Pull request overview

This PR introduces v2 token read endpoints and updates the underlying ApiToken.LastUsed storage/model to use NULL instead of a PostgreSQL -infinity sentinel, aligning the API surface with a nullable “never used” concept.

Changes:

• Make ApiToken.LastUsed nullable and remove the -infinity default from the EF model.
• Add a migration to convert existing -infinity values to NULL (and restore on down migration).
• Add v2 token response DTO + versioned v1/v2 GET endpoints to expose LastUsed as nullable in v2.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
Common/OpenShockDb/OpenShockContext.cs	Removes LastUsed default value SQL from the EF model configuration.
Common/OpenShockDb/ApiToken.cs	Changes LastUsed to DateTime?.
Common/Migrations/OpenShockContextModelSnapshot.cs	Updates snapshot to reflect nullable LastUsed and removed default.
Common/Migrations/20260601005411_MakeApiTokenLastUsedNullable.Designer.cs	Adds migration designer for the nullable LastUsed change.
Common/Migrations/20260601005411_MakeApiTokenLastUsedNullable.cs	Adds migration logic, including data rewrite from -infinity to NULL.
API/Models/Response/TokenResponseV2.cs	Introduces v2 token response model with nullable LastUsed.
API/Controller/Tokens/Tokens.cs	Adds v1/v2-mapped GET endpoints and shared query/projection helpers.
API/Controller/Tokens/GetTokenSelf.cs	Adds v2 self-token endpoint and shares mapping logic between versions.
API/Controller/Tokens/_ApiController.cs	Declares token controller supports API versions 1 and 2.

Files not reviewed (1)

• Common/Migrations/20260601005411_MakeApiTokenLastUsedNullable.Designer.cs: Language not supported

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