fix(plans): show every service in multi-SP plan summary (closes #131)

[cristim]

Summary

Closes #131.

PR #123 (per-plan-type Savings Plans split) gave a single plan up to four aws:savings-plans-<type> entries, but extractPlanInfo in frontend/src/plans.ts rendered only Object.values(services)[0] — hiding all but one. The pre-existing "Multiple" placeholder for >1 service was an unhelpful stub: operators looking at the card had no way to know which SP plan-types the plan covered.

Fix

Replace the "Multiple" branch with a comma-joined list of every service's label. SP slugs get an abbreviated label ("Compute SP", "SageMaker SP", "EC2 Instance SP", "Database SP") so a plan with all four still fits in the summary line. Non-SP slugs pass through unchanged so single-service plans render exactly as before (regression-safe).

Plan shape	Before	After
1 service (EC2)	EC2	EC2 (unchanged)
2 SPs	Multiple	Compute SP, SageMaker SP
4 SPs	Multiple	Compute SP, EC2 Instance SP, SageMaker SP, Database SP
Mixed RI + SP	Multiple	EC2, Compute SP

Tests

• multi-SP plan summary lists every plan-type covered (issue #131) — pins the new behaviour: Compute SP + SageMaker SP both appear, "Multiple" is gone.
• single-service plan still renders one label (no regression) — pins the unchanged single-service path.

All 83 existing plan tests still pass.

Scope

Frontend-only. Backend unchanged.

🤖 Generated with claude-flow

[cristim]

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