Fix evaluate-flags logging integration

[Scott-Sowers-PostHog]

Summary

Fixes the evaluate-flags API route to properly use the logEmitter singleton and correct PostHog SDK method.

Changes

• ✅ Fixed import from non-existent getLogEmitter to logEmitter singleton
• ✅ Converted all log emit calls to use typed methods (info, success, error)
• ✅ Replaced generic emit with task/message/data structure with cleaner method calls
• ✅ Fixed PostHog client shutdown call from shutdownAsync() to shutdown()

Technical Details

Before

import { getLogEmitter } from "@/lib/log-emitter";
const logEmitter = getLogEmitter();
logEmitter.emit("log", { task: "flag-evaluation", message: "...", data: {...} });
await posthogClient.shutdownAsync();

After

import { logEmitter } from "@/lib/log-emitter";
logEmitter.info(`Evaluating flags for ${distinctId}...`);
await posthogClient.shutdown();

Benefits

• Aligns with the standardized logging pattern used in server actions
• Fixes runtime error from incorrect import
• Uses correct PostHog Node.js SDK method
• Cleaner, more readable log messages

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