feat: add help center commands

[scmmishra]

Summary

• add help center listing, article search/listing, and article fetch commands
• add a default help center config with portal and locale resolution
• document the new help center workflow

[scmmishra]

@codex please review

[github-actions]

⚠️ Note: Baseline coverage from main branch is not available (artifact may be expired). Showing current coverage for changed files only.

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/chatwoot/cli/internal/cmd	40.18% (+40.18%)	🌟
github.com/chatwoot/cli/internal/config	73.56% (+73.56%)	🌟
github.com/chatwoot/cli/internal/sdk	56.25% (+56.25%)	🌟

---

Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/chatwoot/cli/internal/cmd/cli.go	0.00% (ø)	0	0	0
github.com/chatwoot/cli/internal/cmd/help_center.go	74.78% (+74.78%)	115 (+115)	86 (+86)	29 (+29)	🌟
github.com/chatwoot/cli/internal/config/config.go	64.10% (+64.10%)	39 (+39)	25 (+25)	14 (+14)	🌟
github.com/chatwoot/cli/internal/sdk/client.go	60.47% (+60.47%)	129 (+129)	78 (+78)	51 (+51)	🌟
github.com/chatwoot/cli/internal/sdk/help_center.go	77.78% (+77.78%)	36 (+36)	28 (+28)	8 (+8)	🌟

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/chatwoot/cli/internal/cmd/help_center_test.go
• github.com/chatwoot/cli/internal/config/config_test.go
• github.com/chatwoot/cli/internal/sdk/help_center_test.go

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

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