Updated trades with in game-data information

[baschny]

Summary

Updated trades.json with in-game data information.

refreshSeconds added to existing trades

The time it takes for an used offer to reset (usually 24h = 86400 seconds).

requiredLevel added to existing trades

A requiredLevel field has been added to ~50 existing trades across all traders. Values used:

• Level 7 — most common, applied to cheap/common items
• Level 12 — mid-tier items (e.g. several Celeste seeds, some Lance attachments, Apollo zipline)
• Level 20 — high-cost items (e.g. Celeste top-tier seeds, Lance & Apollo level-20 items)

New trades added

Shani

• acoustic_guitar — 70 creds, limit 1/day, req. level 12
• shaker — 40 creds, limit 3/day

Tian Wen

• silencer_i — 6,000 coins, limit 1/day, req. level 7
• ferro_iv — 8,700 coins, limit 1/day
• stable_stock_ii — 6,000 coins, limit 2/day, req. level 7
• padded_stock — 15,000 coins, limit 1/day, req. level 20

Apollo

• trailblazer — 6,600 coins, limit 3/day, req. level 7

Trades removed

• Tian Wen — stable_stock_i (1,920 coins, limit 5/day)
• Apollo — heavy_fuze_grenade (4,800 coins, limit 3/day)

Price change

• Apollo deadline: 15,000 → 18,000 coins

[baschny]

Related to this, I have also synced the items/*.json which also contain the trades, in #277