Update TinyPEN controller to use application/ld+json Content-Type

[Copilot]

Upgrades all TinyPEN API requests to use application/ld+json content type instead of application/json, aligning with JSON-LD semantics.

Changes

Updated Content-Type header in database/tiny/controller.js:

• find() - query endpoint
• save() - create endpoint
• update() - update endpoint
• overwrite() - overwrite endpoint
• remove() - delete endpoint

// Before
headers: {
    'Content-Type': 'application/json; charset=utf-8'
}

// After
headers: {
    'Content-Type': 'application/ld+json; charset=utf-8'
}

Note: Requires corresponding TinyPEN service support (tracked in CenterForDigitalHumanities/TinyPen#9).

Original prompt

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This section details on the original issue you should resolve

<issue_title>TinyController application/json+ld Content Type</issue_title>
<issue_description>Upgrade TinyPEN requests to have the content-type "application/json+ld".

At this moment, this is breaking change. This issues is blocked by CenterForDigitalHumanities/TinyPen#9</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes TinyController application/json+ld Content Type #83

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