feat: add a get_min_bond() view for the current minimum bond requirem…

[Mimah97]

Summary

Implement four features: get_min_bond view, per-token bond multiplier configuration, user intents listing, and post-slash cooldown enforcement.

Changes

#62 — Add a get_min_bond() view

• Added view function exposing MIN_BOND constant

#59 — Per-token bond multiplier

• Added set_min_bond_multiplier/get_min_bond_multiplier admin functions
• Multiplier enforced in accept_intent via get_adjusted_min_bond helper
• Defaults to 10 (1.0x) when unset

#58 — List intents by user

• Added list_intents_by_user view function
• UserIntents index maintained during submit_intent

Post-slash cooldown

• Added last_slash_time field to SolverRecord
• SLASH_COOLDOWN (1 hour) enforced in accept_intent
• slash_solver sets cooldown timestamp

Tests

Added 10 tests covering multiplier defaults, bond requirement enforcement, user intent listing, and cooldown expiration.

Closes #61, Closes #62, Closes #59, Closes #58

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