Add offline linked-node owner email notifier (#66)

[aledefra]

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[Copilot]

Pull request overview

Adds an “offline linked nodes” notification path to the backend, including a new HTML email template, email-sending function, notifier job (with throttling backed by CStore), and configuration/cron wiring so specific nodes can run the notifier on a schedule.

Changes:

• Added a new email.nodes.offline.html template plus template loader/cache plumbing and a template getter test.
• Implemented an offline linked-nodes notifier service that fetches oracle node status, resolves node owners, emails confirmed recipients, and throttles sends via CStore (with unit tests).
• Optimized job-details allocation lookups in DailyGetStats by introducing a batched allocation query and tests, and added config/cron/env wiring for the notifier.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
templates/util.go	Registers and exposes a loader for the new offline-nodes email template.
templates/html/email.nodes.offline.html	Adds the HTML email template used to notify owners about offline linked nodes.
templates/cache.go	Caches and exposes the offline-nodes email template via a getter.
templates/cache_test.go	Ensures the new template getter returns the correct template name.
storage/allocationStorer.go	Adds a batched allocation lookup for job-details reuse and refactors the single-job function to use it.
storage/allocationStorer_test.go	Tests the batched allocation lookup selection/order behavior and empty-input handling.
service/statsService.go	Switches job-details allocation lookups from per-job queries to a batched fetch.
service/offlineNodesNotifier.go	Implements the offline linked-nodes notifier (oracle fetch, owner resolution, throttling store, email fanout).
service/offlineNodesNotifier_test.go	Adds unit tests for oracle filtering, config validation, grouping/throttling, and failure handling.
service/emailService.go	Adds SendOfflineNodesEmail and formats offline durations for the template.
deployScripts/deploy_testnet.py	Adds EE_CHAINSTORE_API_URL to the deploy env map and fixes trailing formatting.
deployScripts/deploy_mainnet.py	Adds EE_CHAINSTORE_API_URL to the deploy env map and fixes trailing formatting.
deployScripts/deploy_devnet.py	Adds EE_CHAINSTORE_API_URL to the deploy env map and fixes trailing formatting.
config/config.testnet.json	Adds OraclesApi for testnet.
config/config.mainnet.json	Adds OfflineNodesCronJobTiming and OraclesApi for mainnet.
config/config.go	Extends config schema with OraclesApi and OfflineNodesCronJobTiming plus a getter.
config/config.devnet.json	Adds OraclesApi for devnet.
cmd/main.go	Wires the new offline-nodes notifier cron job into startup based on per-node timing config.
.env.example	Adds EE_CHAINSTORE_API_URL example entry and fixes formatting.

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