Add contact count endpoint and service method

[yamcodes]

Closes #7

Summary by CodeRabbit

New Features

• Added a new API endpoint that returns the total number of contacts currently stored in the system as a plain-text response. This enables users to easily query the contact database size and retrieve aggregated contact count information for monitoring, reporting, and integration purposes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: ccd1e0e4-dea0-47e7-8521-db962ed929dc

📥 Commits

Reviewing files that changed from the base of the PR and between 9d8b476 and 7a17d09.

📒 Files selected for processing (1)

• src/main/java/codes/yam/contacts/ContactController.java

📝 Walkthrough

Walkthrough

This pull request introduces a new HTTP GET endpoint /contacts/count in the ContactController that returns the total number of contacts as plain text. The endpoint delegates to a new count() method in ContactService, which calls the repository's count() operation.

Changes

Cohort / File(s)	Summary
Contact Count Feature src/main/java/codes/yam/contacts/ContactController.java, src/main/java/codes/yam/contacts/ContactService.java	Added count() method to service that delegates to repository, and new @GetMapping("/count") endpoint in controller returning contact count formatted as (%d total contacts)

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• Shadcn UI - like UI #35: Modifies ContactController for listing handler/imports; both PRs affect the same controller class and domain

Poem

🐰 A counter appears with gentle care,
Tallying contacts everywhere,
/count whispers soft and true,
"How many friends do I have? Few!" ✨

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The implementation adds the GET /contacts/count endpoint but the response format '(%d total contacts)' does not match the required format '(42 total Contacts)' with capitalized 'Contacts'.	Update the response format in ContactController.count() to use '(%d total Contacts)' with capitalized 'Contacts' to match issue #7 requirements.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Add contact count endpoint and service method' accurately summarizes the main changes, which include adding a new GET endpoint for contact count and supporting service method.
Out of Scope Changes check	✅ Passed	All changes are directly related to implementing the contact count endpoint feature specified in issue #7; no out-of-scope modifications detected.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 7-add-contact-count-endpoint

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/main/java/codes/yam/contacts/ContactController.java`:
- Around line 113-117: The count() handler in ContactController returns "(%d
total contacts)" but the endpoint contract expects "(%d total Contacts)"; update
the returned formatted string in the count() method to use "Contacts" with a
capital C (keep using contactService.count() and the same formatted pattern
otherwise) so the output exactly matches the specified contract.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 2b845464-64f5-4ac4-a0aa-f5dbf6af1c47

📥 Commits

Reviewing files that changed from the base of the PR and between 5c833c0 and 9d8b476.

📒 Files selected for processing (2)

• src/main/java/codes/yam/contacts/ContactController.java
• src/main/java/codes/yam/contacts/ContactService.java