feat: Add DiscountProgram schema for discount scraper

[NewdlDewdl]

Add DiscountProgram Schema

Summary

Adds DiscountProgram schema to support the new discount programs scraper.

Enables storing and serving 205+ student discount programs from UTD Student Government's Comet Discount Program (https://sg.utdallas.edu/discount/).

Related to UTDNebula/api-tools#109

Changes

Modified: api/schema/objects.go (+9 lines)

Added new schema:

type DiscountProgram struct {
    Id       primitive.ObjectID `bson:"_id" json:"_id"`
    Category string             `bson:"category" json:"category"`
    Business string             `bson:"business" json:"business"`
    Address  string             `bson:"address" json:"address"`
    Phone    string             `bson:"phone" json:"phone"`
    Email    string             `bson:"email" json:"email"`
    Website  string             `bson:"website" json:"website"`
    Discount string             `bson:"discount" json:"discount"`
}

Related PRs

• api-tools PR Exam/all endpoint #110: Implements the scraper/parser (depends on this being merged first)

Impact

• ✅ No breaking changes
• ✅ New schema only, no logic changes
• ✅ ~205 discount programs, ~500KB data

[NewdlDewdl]

⚡ Quick Review Request

@mikehquan19 This PR should be merged first before api-tools PR #110.

Why This is Low-Risk:

• ✅ Only adds a new schema (9 lines)
• ✅ No breaking changes
• ✅ No logic modifications
• ✅ No dependencies

What It Enables:

Once merged, this unblocks api-tools PR #110 which:

• Scrapes 205+ discount programs
• Includes full test coverage
• Currently has failing checks only because this schema doesn't exist yet

This is the foundation for closing issue #109. Ready to merge!