feat(orchestrator): fetch chain details at startup with retry

[heemankv]

Pull Request type

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Testing
• Other (please describe):

What is the current behavior?

Currently, the orchestrator fetches chain configuration (chain_id, fee token addresses) during SNOS job processing. This means:

1. Every SNOS job makes an RPC call to fetch chain_id
2. Fee token addresses (strk_fee_token_address, eth_fee_token_address) must be manually configured via environment variables
3. If the RPC is temporarily unavailable during job processing, the job fails immediately without retry

Resolves: #NA

What is the new behavior?

• Chain details fetched once at startup: A new ChainDetails struct is fetched at orchestrator startup with retry logic (5s interval, 5min timeout)

  • chain_id fetched from RPC (starknet_chainId)
  • Fee token addresses fetched from feeder gateway (/feeder_gateway/get_contract_addresses)

• No more env vars for fee tokens: Fee token addresses are now dynamically fetched from the node, removing the need for MADARA_ORCHESTRATOR_STRK_NATIVE_FEE_TOKEN_ADDRESS and MADARA_ORCHESTRATOR_ETH_NATIVE_FEE_TOKEN_ADDRESS environment variables

• Fail-fast at startup: If the node is unreachable, the orchestrator fails at startup rather than mid-job processing

Does this introduce a breaking change?

Yes - The following environment variables are no longer used and can be removed:

• MADARA_ORCHESTRATOR_STRK_NATIVE_FEE_TOKEN_ADDRESS
• MADARA_ORCHESTRATOR_ETH_NATIVE_FEE_TOKEN_ADDRESS

Migration: Simply remove these environment variables from your configuration. The orchestrator will now fetch these values automatically from the node's feeder gateway.

Other information

Architecture

Startup Flow:
┌─────────────────┐     ┌──────────────┐     ┌─────────────────────┐
│  Orchestrator   │────▶│ ChainDetails │────▶│  RPC: chain_id      │
│    Startup      │     │   ::fetch()  │     │  FG: fee tokens     │
└─────────────────┘     └──────────────┘     └─────────────────────┘
                              │ retry (5s interval, 5min timeout)
                              ▼
                        ┌──────────────┐
                        │   Config     │
                        │ (cached)     │
                        └──────────────┘

SNOS Job Flow:
┌─────────────────┐     ┌──────────────────────────────┐
│   SNOS Job      │────▶│ config.chain_details()       │ (instant, no RPC)
│  process_job()  │     │   .to_chain_config()         │
└─────────────────┘     └──────────────────────────────┘

[heemankv]

Self Review done, lgtm