Add Cypress workspace image creation flow

[cybercraftsolutionsllc]

Summary

• extend cy.create_workspace with an optional in-memory PNG upload via the real workspace file input
• add Cypress coverage for creating an organization/workspace with an uploaded image
• document the optional image filename in the Cypress workspace command type

Closes #427.

Validation

• npx tsc --noEmit --target es2015 --types cypress,node --moduleResolution node cypress\global.d.ts cypress\support\commands.ts cypress\e2e\26_createOrgWithImage.cy.ts
• npx eslint cypress\e2e\26_createOrgWithImage.cy.ts --max-warnings 100
• git diff --check

Note: full npx tsc -p cypress\tsconfig.json --noEmit is currently blocked by existing unrelated Cypress project type errors, including 10_payBounty.cy.ts using "Less than 3 hour", missing fixture module declarations, and dependency private identifiers under the ES5 Cypress target.