refactor(ai): move Ask AI domain logic out of the provider adapter

[Reversean]

src/integrations/ holds adapters to external services. The Ask AI prompt assembly, the
model instruction and the event serialisation live there today, inside the Vercel adapter,
even though none of them import anything from the provider. They are domain code that ended
up in an adapter directory.

This has two consequences. Replacing the provider drags the domain along with it, and any
policy applied around the model call can only be reused by importing from another adapter's
internals.

Move the domain modules to src/services/askAi/ and reduce VercelAIApi to a transport that
takes a system/prompt pair and returns text:

complete({ system, prompt }: CompletionParams): Promise<string>

Orchestration moves to AIService, which already owns the event lookup.
instructions/cto.ts and inputs/eventSolving.ts are moved unchanged.

This also places anything applied to the model's input or output above the transport, so
swapping the provider cannot silently drop it.

No behaviour change: AIService.generateSuggestion keeps its signature and its only caller,
src/resolvers/event.js, is untouched.

[Copilot]

Pull request overview

This PR refactors the “Ask AI” feature by moving prompt/instruction assembly out of the Vercel AI integration adapter and into a dedicated domain area under src/services/askAi/, leaving src/integrations/vercel-ai/ as a thin transport layer.

Changes:

• Moved Ask AI domain prompt/instruction modules into src/services/askAi/ and updated AIService.generateSuggestion to assemble { system, prompt } there.
• Simplified the Vercel adapter API to complete({ system, prompt }): Promise<string> and added unit coverage for it.
• Added unit tests to validate AIService.generateSuggestion orchestration and the Vercel transport behavior; bumped package version.

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/services/ai.ts	Moves orchestration into AIService and calls the adapter via complete({ system, prompt }).
src/integrations/vercel-ai/index.ts	Refactors the adapter to a transport-style complete method that forwards to generateText.
src/services/askAi/instructions/cto.ts	Adds the CTO system instruction in the new domain location.
src/services/askAi/inputs/eventSolving.ts	Adds event prompt serialization in the new domain location.
test/services/askAi.test.ts	Adds unit tests asserting AIService.generateSuggestion calls the transport with the assembled system/prompt.
test/integrations/vercel-ai.test.ts	Adds unit tests asserting adapter forwards to generateText and returns text.
package.json	Bumps version to 1.5.10.

Comments suppressed due to low confidence (1)

src/integrations/vercel-ai/index.ts:39

• Continuation of the indentation issue: this docblock/method body is indented differently from the surrounding codebase (2-space blocks). Reformatting here will keep the file consistent and avoid noisy diffs from auto-formatting.

     * Send a system/prompt pair to the model and return the generated text
     *
     * @param {CompletionParams} params - system instruction and prompt to complete
     * @returns {Promise<string>} text generated by the model
     * @todo add defence against invalid prompt injection

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