feat: Branch and file selector

[alex289]

Type of change

• 🐛 Bug fix
• 🚀 New feature
• ❓ Other (please specify)

Description

• Add endpoints for getting repository branches and trees
• Show branch and file selector

Additional context

• Disable goconst because it's too strict

[codecov]

Codecov Report

❌ Patch coverage is 83.10413% with 86 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/internal/hub/repositories/gitlab.go	81.97%	18 Missing and 13 partials ⚠️
backend/internal/hub/repositories/gitea.go	87.59%	9 Missing and 8 partials ⚠️
backend/internal/hub/repositories/github.go	86.08%	8 Missing and 8 partials ⚠️
backend/internal/hub/routes/applications.go	68.75%	6 Missing and 4 partials ⚠️
backend/internal/hub/routes/repositories.go	72.97%	7 Missing and 3 partials ⚠️
backend/internal/hub/repositories/provider.go	85.71%	1 Missing and 1 partial ⚠️

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[Copilot]

Pull request overview

Adds repository branch/tree APIs and wires them into the “Upsert Application” dialog to provide an in-app branch selector and compose-file picker.

Changes:

• Backend: introduce /repositories/:id/branches and /repositories/:id/tree?branch=... endpoints and extend repository providers to list branches and tree entries.
• Frontend: update SWR fetch hook to support conditional fetching and add branch + file-tree selection UI in the application dialog.
• Tooling: remove goconst from backend golangci-lint config.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
frontend/src/lib/api.ts	Allow useFetch to accept null keys for conditional SWR requests.
frontend/src/components/ui/collapsible.tsx	New collapsible UI wrapper used by the file tree.
frontend/src/components/dialogs/upsert-application.tsx	Adds branch selector + repository tree browser for selecting a compose file path.
backend/internal/hub/routes/repositories_test.go	Adds route-level tests for new branches/tree endpoints; enhances HTTP mock helper.
backend/internal/hub/routes/repositories.go	Adds route handlers for listing branches and repository tree; adds shared repo/provider resolver.
backend/internal/hub/repositories/provider_test.go	Extends stub provider and adds unit test for branch sorting behavior.
backend/internal/hub/repositories/provider.go	Extends Provider interface with ListBranches/ListTree; adds TreeEntry types and branch sorting helper.
backend/internal/hub/repositories/gitlab_test.go	Adds/extends GitLab provider tests for auth methods, pagination, and new APIs.
backend/internal/hub/repositories/gitlab.go	Implements GitLab ListBranches/ListTree and refactors URL parsing/auth header handling.
backend/internal/hub/repositories/github_test.go	Adds/extends GitHub provider tests for auth methods and new APIs.
backend/internal/hub/repositories/github.go	Implements GitHub ListBranches/ListTree and consolidates header logic.
backend/internal/hub/repositories/gitea_test.go	Adds/extends Gitea provider tests for auth methods and new APIs.
backend/internal/hub/repositories/gitea.go	Implements Gitea ListBranches/ListTree and refactors URL parsing/header handling.
backend/internal/hub/handlers.go	Registers new repository branches/tree routes.
backend/.golangci.yml	Disables goconst linter.

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