Fix validation metadata and subscription limits

[iamcracked-dev]

Closes #851
Closes #850
Closes #849
Closes #848

Changes

• Corrected the backend package license metadata from ISC to Apache-2.0 to match the repository license.
• Aligned frontend campaign title validation with the backend 200-character limit and added coverage for the client-side rejection.
• Added default and maximum caps to subscription history lookup so subscriber history queries are no longer unbounded.
• Replaced broad explicit any mock assertions in the three lint-targeted frontend tests with typed helpers and store mocks.

Testing

• Not run, per request.

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