Added Prompt for tools (#68)

* Create detailed markdown instructions for all toolkits
* Update all toolkit classes to load instructions from external .md files
* Add query examples for cryptocurrency report generation

src/app/api/tools/instructions/market_instructions.md

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+# Market APIs - Instructions
+
+## Tools (6)
+**Single-source (fast):** First available provider
+1. `get_product(asset_id)` - Current price, 1 asset
+2. `get_products(asset_ids)` - Current prices, multiple assets
+3. `get_historical_prices(asset_id, limit=100)` - Price history, 1 asset
+
+**Aggregated (accurate):** All providers, VWAP calculation
+4. `get_product_aggregated(asset_id)` - Accurate price, 1 asset (4x API calls)
+5. `get_products_aggregated(asset_ids)` - Accurate prices, multiple (4x per asset)
+6. `get_historical_prices_aggregated(asset_id, limit=100)` - Historical, all sources (4x calls)
+
+## Selection Strategy
+- Quick check → single-source (tools 1-3)
+- Keywords "accurate", "reliable", "comprehensive" → aggregated (tools 4-6)
+
+## Key Mappings
+**Assets:** Bitcoin→BTC, Ethereum→ETH, Solana→SOL, Cardano→ADA, Ripple→XRP, Polkadot→DOT, Dogecoin→DOGE
+**Time:** "7 days"→limit=7, "30 days"→limit=30, "24h"→limit=24, "3 months"→limit=90
+
+## Critical Rules
+- Never fabricate data - only report actual tool outputs
+- Include: ticker, price+currency, timestamp, provider source
+- Failure handling: Report explicit error, no placeholder data
+- Be concise to save tokens