[STU-106] Add company contacts and stores management pages

[BAWES]

Summary

Adds company-scoped contacts and stores management:

• Contacts page (/company/contacts) — DataTable listing of all contacts linked to the user's companies, with add/remove forms
• Stores page (/company/stores) — DataTable listing of all store locations linked to the user's companies, with add/remove forms
• Server actions with Zod validation for add/remove contact and add/remove store operations
• Data helpers scoped to linked companies via company_contact join
• Navigation entries for Contacts and Stores in the company workspace rail

Dependencies

• Depends on STU-105 (merged) which provides company-data.ts and the "New Request" button pattern

Test plan

• Type check passes (npx tsc --noEmit)
• Company user can view contacts page at /company/contacts
• Company user can view stores page at /company/stores
• Add contact form validates required fields
• Add store form validates required fields
• Remove buttons work with confirmation flow

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Project	Deployment	Actions	Updated (UTC)
studenthub-next	Error		May 21, 2026 10:54am

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