fix: TTL bump on markets storage reads

[ogaziedaniel80-droid]

Summary

Bump persistent storage TTL on hot read paths in markets to prevent frequently-accessed markets from expiring.

Changes

• markets.rs: MarketStateManager::get_market() extends persistent TTL on cache miss
• queries.rs: QueryManager::get_market_from_storage() extends persistent TTL on query reads
• 4 focused tests added
• Changed get_market_from_storage visibility to pub(crate) for testability

Acceptance Criteria

• Implementation matches description
• Tests added (4 tests: cache miss bump, cache hit non-bump, max_ttl clamp, query path bump)
• Tests passing (run cargo test --package predictify-hybrid)
• Lint passing (run cargo clippy)
• Docs updated (inline doc comments)

Implementation Details

Problem

Market storage reads on hot paths did not bump persistent TTL, meaning frequently-queried markets could expire even while actively used.

Solution

Added TTL extension calls using MARKET_TTL_LEDGERS.min(env.storage().max_ttl()) on two hot read paths:

1. Cache miss in get_market() (markets.rs): When a market is fetched from persistent storage and not in the instance cache, the persistent TTL is extended to the full market tier.

2. Direct reads in get_market_from_storage() (queries.rs): All query functions that bypass the instance cache now extend persistent TTL on read.

Tests

• test_get_market_bumps_persistent_ttl_on_cache_miss — verifies TTL refresh on cache miss
• test_get_market_cache_hit_does_not_bump_persistent_ttl — verifies cache hits only bump instance TTL
• test_get_market_ttl_bump_respects_max_ttl — verifies TTL never exceeds max_ttl()
• test_get_market_from_storage_bumps_persistent_ttl — verifies query path TTL refresh

Closes #861

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[greatest0fallt1me]

Merged via direct push to master (admin)