Add input validation for framework and options in POST /analyze endpoint

[Copilot]

The POST /analyze handler validated file.content but not framework or options, causing TypeErrors when buildClinePrompt accessed options.generateEdgeCases or options.includeSetup on undefined values.

Changes:

• Framework validation: Require framework parameter and validate against supported values (jest, vitest, mocha). Return 400 with explicit error message on invalid input.

• Options normalization: Coerce options to empty object if null/undefined/array. Default generateEdgeCases and includeSetup to false if not boolean.

Example:

// Before: TypeError if options undefined
const prompt = buildClinePrompt(file, framework, options);
// options.generateEdgeCases accessed on undefined

// After: Safe defaults prevent TypeError
if (!options || typeof options !== 'object' || Array.isArray(options)) {
    options = {};
}
if (typeof options.generateEdgeCases !== 'boolean') {
    options.generateEdgeCases = false;
}
if (typeof options.includeSetup !== 'boolean') {
    options.includeSetup = false;
}

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