feat: add OI / Liquidation / cex-symbol endpoints (55 total)

[haminprk]

Auto-generated SDK regen picking up 9 new public REST endpoints on the DataMaxi+ data API (44 → 55 total).

Endpoints added

Liquidation

Endpoint	Path
liquidation_heatmap	GET /api/v1/liquidation/heatmap
liquidation_map	GET /api/v1/liquidation/map
liquidation_symbol_history	GET /api/v1/liquidation/symbol-history

Open Interest

Endpoint	Path
open_interest_overview	GET /api/v1/open-interest/overview
open_interest_summary	GET /api/v1/open-interest/summary
open_interest_history_aggregated	GET /api/v1/open-interest/history-aggregated

CEX Symbol (per-base aggregates)

Endpoint	Path
cex_symbol_oi	GET /api/v1/cex/symbol/oi
cex_symbol_oi_stats	GET /api/v1/cex/symbol/oi-stats
cex_symbol_liquidation	GET /api/v1/cex/symbol/liquidation

Usage

use datamaxi::Client;

let client = Client::new("YOUR_API_KEY");

// Liquidation heatmap (token × exchange, rolling window)
let heatmap = client.liquidation_heatmap()
    .window("1h")
    .top_n(10)
    .send()
    .await?;

// Per-token aggregated OI history with per-exchange breakdown
let history = client.open_interest_history_aggregated()
    .token_id("bitcoin")
    .interval("1h")
    .send()
    .await?;

Test plan

• Generated against the latest OpenAPI spec via datamaxi-codegen
• cargo check passes
• cargo build passes

Notes

Generated content only — no manual edits. The corresponding REST documentation (https://docs.datamaxiplus.com) and Python SDK have been updated in parallel.