Write contract related mock API

[RexBearIU]

Write contract related mock API with WIKI

• [x] #1268

[RexBearIU]

• [X] GET ask_ai/ contract
• [X] GET OCR add query type
• [X] GET OCR/resultId need to reshape
• [x] GET /company/:companyId/contract
• [x] POST /company/:companyId/contract
• [X] GET /company/:companyId/contract/:contractId
• [X] PUT /company/:companyId/contract/:contractId

[RexBearIU]

It takes 5 hours.

remaining change docs.

[RexBearIU]

It takes 1.5 hours.

done