feat(repo): add creation and approval

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[Copilot]

Pull request overview

This PR wires an end-to-end repo-creation request feature into Artemis, adding GitHub App-backed repo creation, Valkey-backed request tracking, HTTP handlers, routing, config, and tests.

Changes:

• Adds /api/repo* routes behind feature wiring and implements create/list/get/approve/reject/templates handlers.
• Adds repo-request domain types plus a Valkey queue store with optimistic transitions.
• Adds GitHub App JWT/client support and optional config/main wiring for the feature.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
internal/server/server.go	Mounts feature-gated repo routes under /api.
internal/server/server_test.go	Tests repo routes are mounted only when dependencies are wired.
internal/reporequest/types.go	Adds repo-request statuses, visibility, validation, and sentinel errors.
internal/reporequest/types_test.go	Covers repo-request domain validation helpers.
internal/reporequest/valkey/store.go	Adds Valkey-backed repo-request queue implementation.
internal/reporequest/valkey/store_test.go	Tests queue creation, transitions, dedupe, concurrency, and ordering.
internal/handler/handler.go	Extends Handlers with repo feature dependencies/config.
internal/handler/repo.go	Implements repo request HTTP handlers and repo team authorization.
internal/handler/repo_test.go	Tests repo handlers, validation, authz, approval, rejection, and templates.
internal/githubapp/jwt.go	Adds GitHub App JWT signer.
internal/githubapp/jwt_test.go	Tests key parsing and JWT signing claims.
internal/githubapp/client.go	Adds GitHub App REST client for tokens, repo creation, and templates.
internal/githubapp/client_test.go	Tests app token caching, repo creation, template creation, and template filtering.
internal/config/config.go	Adds optional repo feature and GitHub App configuration.
internal/config/config_repo_test.go	Tests repo config defaults, overrides, and partial app config validation.
cmd/artemis/main.go	Wires optional repo store, GitHub App client, and repo org auth client into the server.

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[Copilot]

Pull request overview

Copilot reviewed 16 out of 16 changed files in this pull request and generated 4 comments.