Add CreateJwt MCP tool for Dev Proxy jwt create command

[Copilot]

• Create src/createJwt.ts - implements the devproxy jwt create command execution with all supported parameters
• Update src/index.ts - register the new CreateJwt MCP tool with Zod parameter schemas
• Add .default(60) to validFor for practical token lifetime out of the box
• Add .min(32) to signingKey for schema-level validation
• Build and verify the changes compile successfully

[garrytrinder]

A couple of suggestions for the schema definitions.

[garrytrinder]

Consider adding .default(60) here so tokens have a useful lifetime out of the box. Without it, the CLI defaults to 0 minutes (token expires immediately on creation), which isn't practical for testing.

Suggested change

	validFor: z.number().optional().describe('The token validity in minutes'),
	validFor: z.number().optional().default(60).describe('The token validity in minutes'),

[Copilot]

Applied in a4324bf — added .default(60) to validFor.

[garrytrinder]

Since the description already states the minimum length, worth enforcing it at the schema level with .min(32) for a better error message (vs a cryptic CLI error).

Suggested change

	signingKey: z.string().optional().describe('The signing key for the token. Must be at least 32 characters'),
	signingKey: z.string().min(32).optional().describe('The signing key for the token. Must be at least 32 characters'),

[Copilot]

Applied in a4324bf — added .min(32) to signingKey.

[garrytrinder]

@copilot address the PR comments

[garrytrinder]

Tested locally — builds clean, all params flow correctly, default validFor and signingKey min validation working as expected. Ship it.