feat: Python SDK, Trivela CLI, OpenAPI codegen pipeline, and local devnet

[kulayddon]

Summary

• feat: Official Python SDK #613 — Official Python SDK (sdk/python/trivela): typed dataclasses from OpenAPI schemas, TrivelaClient with campaigns, organizations, audit_logs, and admin resource namespaces, cursor-pagination helper, retry/idempotency support, pytest suite, PyPI publish workflow.
• feat: trivela CLI for campaign & contract management #614 — Trivela CLI (cli/): Node/Commander CLI with contracts deploy|init, campaign create|activate|close|list|get, allowlist import, rewards fund|credit, stats, and config get|set|clear. Mainnet guardrails, dry-run mode, secrets never logged.
• feat: OpenAPI client codegen pipeline (fail CI on drift) #615 — OpenAPI codegen pipeline: sdk/client/src/types.gen.ts generated from backend/openapi.yaml; openapi-codegen.yml CI workflow regenerates and fails on git diff --exit-code if committed output is stale.
• feat: Local one-command devnet (contracts + backend + frontend + indexer) #616 — Local one-command devnet: devnet Docker Compose profile with stellar/quickstart local network, devnet-bootstrap.sh (deploys contracts, writes .env.devnet, seeds 3 demo campaigns), backend and frontend wired up. Start with make dev or npm run dev:devnet; tear down with make dev-down.

Closes #613, Closes #614, Closes #615, Closes #616

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