Fix public_read property reporting in GET single and PUT/POST project endpoints

[Copilot]

The public_read property was missing from GET single project responses and PUT/POST responses returned the input value instead of the database value, causing inconsistent reporting across endpoints.

Changes

GET single project (getProjectFunc)

• Added PublicRead: p.PublicRead.Bool to ProjectFull response initialization

PUT/POST project (putProjectFunc)

• Added RetrieveProject query after upsert to fetch actual database values
• Changed response from input.Body.PublicRead to proj.PublicRead.Bool

// Before: echoed input
response.Body.PublicRead = input.Body.PublicRead

// After: query and use actual DB value
proj, err := queries.RetrieveProject(ctx, database.RetrieveProjectParams{
    Owner:         input.UserHandle,
    ProjectHandle: projectHandle,
})
response.Body.PublicRead = proj.PublicRead.Bool

Tests

• Updated public_access_test.go expectation from false to true
• Added public_read_property_test.go with coverage for all endpoints

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[awagner-mainz]

Looks good.