refactor(rendering, docs): simplify shadow map texture bindings and update PBR texture conventions in README

refactor(rendering, shaders): remove unused texture bindings and properties; add alpha cutout support and optimize shadow map slots

refactor(config, rendering, textures): update texture slot assignments; add dedicated slots for standard PBR textures; clean up unused shader texture bindings

refactor(rendering, textures, shaders): separate AO map from ORM texture; update shaders, texture types, and sphere model logic accordingly

refactor(pbr, textures, rendering): update texture handling to support AO (Ambient Occlusion) map; adjust resource manager, glTF mappings, and shader-related assets accordingly

refactor(threadPool): replace `mCV` with `mHasJob` and improve mutex usage for thread synchronization

refactor(rendering): simplify `withTextureFPMultisampled` API by removing `channels` parameter and updating internal format logic

docs(README): update

docs(README): add PBR workflow details and texture conventions

refactor(pbr, textures, rendering, shaders): migrate to ORM (Occlusion, Roughness, Metallic) texture format; update PBR workflow, shaders, and sphere model interface accordingly

refactor(core, rendering): replace `int` with `uint32_t` or appropriate types for loop indices, sizes, and uniforms; improve type consistency across modules

refactor(rendering): standardize framebuffer API parameters, replace `channels` with GL enums, and update internal format logic

refactor(rendering): rename `dirUpPairs` to `mDirUpPairs`, remove unused constant, and improve loop consistency in shadow pass

refactor(rendering): simplify SSAO and PBR map generation by removing unnecessary context dependencies

refactor(pbr): modularize PBR map generation