added pause status integration

[Harbduls]

Closes #133

Summary of Changes

1. Backend Changes (Listener)

• Added a new endpoint /api/status :

  • Queries each configured smart contract for its pause status using get_paused_status()
  • Uses simulation to call the contract, no actual transaction needed
  • Returns timestamp and contracts array with address , paused , and optional error

• Updated config system :

  • Added stellarNetworkPassphrase to Config type
  • Added a default value and env var support for STELLAR_NETWORK_PASSPHRASE

• Updated events server :

  • Added stellarNetworkPassphrase and contractAddresses to EventsServerOptions
  • Implemented getContractPauseStatus and buildStatusResponse functions

• Updated tests :

  • Updated events-server.test.ts to mock all the new Stellar SDK functions
  • Added the new required fields to all createEventsServer test calls

2. Frontend Changes (Dashboard)

• New status API types and function in eventsApi.ts :

  • ContractStatus and StatusResponse interfaces
  • fetchStatus to get contract statuses

• New UI section :

  • Added a "Contract Status" section at the top of EventExplorerPage
  • Shows each configured contract with its active/paused status
  • Uses styling consistent with the existing theme

• Updated Event Explorer components :

  • EventExplorerPage : fetches contract status and passes to table
  • EventExplorerTable : receives contract status and passes to each card
  • EventExplorerCard : shows a "Paused" badge if the event's contract is currently paused

3. Documentation

• Updated API.md : added complete documentation for /api/status
• Updated listener's .env.example : added the new env variable
• Added CSS styles for contract status UI

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