feat: add project HttpApi read slice behind OPENCODE_EXPERIMENTAL_HTTPAPI

- migrate Project.Info from Zod to Effect Schema (Schema.Class for Info,
  Schema.Struct for inner Icon/Commands/Time to avoid SDK drift)
- derive .zod compat surfaces for Hono routes and UpdateInput
- add project httpapi route with list and current endpoints
- wire into httpapi/server.ts and bridge behind flag
- fix bridge ordering: mount bridge sub-app at / before all Hono routes
  so Effect handlers always take priority when the flag is on
- zero SDK diff confirmed