Add Docker Compose `watch` mode for local development

[Levi-Ojukwu]

Description
Developers making changes to the indexer or notifications service must manually restart Docker containers to see their changes. Docker Compose's watch feature (available since Compose 2.22) hot-reloads containers when source files change.

Requirements and context

• Update docker-compose.yml with develop.watch configuration for indexer and notifications services
• File sync: changes to indexer/src/ trigger a rebuild and restart of the indexer container
• Rebuild trigger: changes to indexer/package.json trigger a full image rebuild
• Document the docker compose watch command in docs/local-development.md
• Write a brief demo section showing the development loop in action

Suggested execution

git checkout -b feat/docker-compose-watch

• Update docker-compose.yml with watch configuration
• Test the hot-reload loop for both services
• Document in docs/local-development.md

Example commit message
feat: add Docker Compose watch mode for hot-reload during local development

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