docs: add missing OpenAPI spec for historySince, ADL rankings, and chart

[0x-SquidSol]

Summary

• Issue: Three fully implemented, registered endpoints were completely absent from openapi.yaml. An external auditor comparing spec to implementation would flag these immediately.
• Fix: Adds complete OpenAPI 3.0.3 path entries and component schemas for all three endpoints.

Endpoints added

Endpoint	Description	Schemas added
GET /funding/{slab}/historySince	Funding history with required since timestamp	Reuses existing FundingHistoryEntry
GET /api/adl/rankings	ADL trigger state and ranked positions	AdlRankingsResponse, AdlRankedPosition
GET /chart/{mint}	OHLCV candlestick data via GeckoTerminal	ChartResponse, OhlcvCandle

Details

• All parameters, defaults, constraints, and status codes verified against actual route implementations
• ADL endpoint documents X-Cache header and 504 timeout response
• Chart endpoint notes timeframe-dependent aggregate defaults in description
• Added ADL and Chart tags to the tags section

Test plan

• vitest run passes (186/186 tests)
• YAML has no tab indentation issues
• Cross-checked all params, response shapes, and status codes against source

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ef4b15fd-c103-4191-b983-69a3d152de9d

📥 Commits

Reviewing files that changed from the base of the PR and between fb94c29 and 1488f52.

📒 Files selected for processing (1)

• openapi.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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