Feat/solver extensions and batch

[aji70]

Summary

This PR adds three interconnected features for the vortex protocol:

1. Add get_solver_count view backed by the existing TotalSolvers stat #55 - Add get_solver_count view backed by the existing TotalSolvers stat
2. Add batch_submit_intent / batch_accept_intent for gas-conscious callers #56 - Add batch_submit_intent / batch_accept_intent for gas-conscious callers
3. Add a grace-period extension mechanism for solvers close to missing the fill window #57 - Add grace-period extension mechanism for solvers close to missing the fill window

Changes

#55 — Add get_solver_count view

• Added get_solver_count() view returning total registered solvers
• Backed by existing TotalSolvers stat already tracked in register_solver/deregister_solver
• Added test verifying count increments and decrements correctly

#56 — Batch intent operations

• Added batch_submit_intent() accepting vec of intent parameters
• Added batch_accept_intent() accepting vec of intent IDs
• Both bounded by MAX_BATCH_SIZE (100) to prevent resource exhaustion
• Full batch reverts on any item failure (transaction atomicity)
• Added tests for:
  • Multiple intents submitted/accepted successfully
  • Batch size limit enforcement
  • Partial failure behavior (all-or-nothing)

#57 — Fill window extension mechanism

• Added request_extension() entrypoint for Accepted intents
• Grants exactly one extension per intent (abuse limit)
• Extends deadline by MAX_EXTENSION_DURATION (5 minutes)
• Only the assigned solver can request
• Only on Accepted intents
• Added tests for:
  • Extension granted once and tracked
  • Second request rejected
  • Authorization checks (wrong solver)
  • State validation (must be Accepted)
  • Practical test: extension allows late fill within extended window

Notes

• Code-only delivery: no install/build/test/scripts run during implementation
• Committer: aji70 (Ajidokwu Sabo)
• Three separate commits, one per issue, for clear attribution
• All features follow existing code patterns and conventions

Closes #54, Closes #55, Closes #56, Closes #57

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