fix: add .js extensions to .d.ts imports for node16 resolution

[robertsLando]

Summary

• Adds .js extensions to all relative imports in .d.ts type definition files
• Fixes TypeScript moduleResolution: "node16" failing to resolve types when importing aedes

Closes #1082

Details

With moduleResolution: "node16" and "type": "module", TypeScript strictly requires file extensions on relative imports. PR #1081 added the types condition to package.json exports, allowing TypeScript to find the entry aedes.d.ts, but the internal relative imports within the .d.ts files still lacked .js extensions, causing resolution failures.

Files changed:

• aedes.d.ts — entry point re-exports
• types/client.d.ts — imports from packet and instance
• types/instance.d.ts — imports from client and packet
• types/packet.d.ts — imports from client
• test/types/aedes.test-d.ts — test import from types/packet

Test plan

• npm run test:typescript (tsd) passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.47%. Comparing base (806615e) to head (1de4554).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1083   +/-   ##
=======================================
  Coverage   99.47%   99.47%           
=======================================
  Files          15       15           
  Lines        1921     1921           
=======================================
  Hits         1911     1911           
  Misses         10       10           

Flag	Coverage Δ
unittests	99.47% <ø> (ø)

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