feat(partners): add utility functions for partner business activity allocation limits and remaining licenses

- Implemented `getPartnerBusinessActivityAllocationLimits` to retrieve allocation limits for a partner's business activity.
- Added `ensurePartnerBusinessActivityHasRemainingAllocation` to validate remaining allocation credits.
- Created `getPartnerRemainingLicenses` to count remaining licenses for a partner.
- Developed `getPartnerFirstRemainingLicense` to fetch the first unused license for a partner.
- Introduced `ensurePartnerHasRemainingLicense` to ensure a partner has at least one unused license.

src/modules/partners/partners.controller.ts

@@ -10,7 +10,12 @@ export class PartnerController {
   constructor(private service: PartnerService) {}
 
   @Get('')
-  async findOne(@PartnerInfo('id') partnerId: string) {
+  async me(@PartnerInfo('id') partnerId: string) {
+    return this.service.me(partnerId)
+  }
+
+  @Get('info')
+  async getInfo(@PartnerInfo('id') partnerId: string) {
     return this.service.getInfo(partnerId)
   }