[Param Update] Align Jay Network with Cosmos Hub — Inflation, Slashing, Staking & Governance

Aligns Jay Network's economic and operational parameters with Cosmos Hub mainnet to improve external validator experience, reduce supply dilution pressure, and strengthen long-term governance.

Changes 4 modules in a single atomic transaction:

[Mint]
- inflation_max: 0.20 -> 0.10 (halve inflation cap)
- inflation_rate_change: 0.13 -> 1.00 (faster PI convergence)

[Staking]
- max_validators: 100 -> 200 (broader active set)
- min_commission_rate: 0.00 -> 0.05 (5% commission floor)

[Slashing]
- signed_blocks_window: 100 -> 10000 (longer measurement window)
- min_signed_per_window: 0.50 -> 0.05 (relaxed liveness requirement)
- slash_fraction_downtime: 0.01 -> 0.0001 (reduce downtime penalty)

[Governance]
- voting_period: 48h -> 168h (7 days)
- quorum: 0.334 -> 0.40

Distribution module is already aligned (community_tax 2%, no proposer rewards) so no changes there. Block time (5s) is intentionally kept to preserve service responsiveness; blocks_per_year remains 6,311,520. Bond denom (ujay), chain id (thejaynetwork), bech32 prefix (yjay), and the CosmWasm module are retained as chain identity.

Effective immediately upon proposal passage; no chain halt or binary upgrade required.

Projected impact:
- Long-term supply growth ceiling halved (20%/yr -> 10%/yr max)
- Staking APR drops as inflation cap drops; further normalizes as bonded ratio rises toward the 67% goal
- Operator-friendly slashing (100x more lenient downtime penalty)
- All currently-active validators are already at 5% commission, so no operator is force-clamped