feat: add OpenRouter audit generation pipeline

lib/ai/model-profiles.ts

@@ -0,0 +1,81 @@
+export const MODEL_PROFILE_KEYS = [
+  "classification",
+  "multimodalAudit",
+  "germanCopy",
+  "qualityReview",
+] as const;
+
+export type ModelProfileKey = (typeof MODEL_PROFILE_KEYS)[number];
+
+export type AiModelProfile = {
+  modelId: string;
+  temperature: number;
+  maxTokens: number;
+  supportsImages: boolean;
+  stage: (typeof MODEL_PROFILE_KEYS)[number];
+  envOverrideKey: string;
+};
+
+export const MODEL_PROFILES: Record<ModelProfileKey, AiModelProfile> = {
+  classification: {
+    modelId: "openai/gpt-4.1-mini",
+    temperature: 0.2,
+    maxTokens: 1200,
+    supportsImages: false,
+    stage: "classification",
+    envOverrideKey: "OPENROUTER_MODEL_CLASSIFICATION",
+  },
+  multimodalAudit: {
+    modelId: "openai/gpt-4.1-mini",
+    temperature: 0.3,
+    maxTokens: 2800,
+    supportsImages: true,
+    stage: "multimodalAudit",
+    envOverrideKey: "OPENROUTER_MODEL_MULTIMODAL_AUDIT",
+  },
+  germanCopy: {
+    modelId: "openai/gpt-4.1-mini",
+    temperature: 0.4,
+    maxTokens: 1800,
+    supportsImages: false,
+    stage: "germanCopy",
+    envOverrideKey: "OPENROUTER_MODEL_GERMAN_COPY",
+  },
+  qualityReview: {
+    modelId: "openai/gpt-4.1-mini",
+    temperature: 0.1,
+    maxTokens: 900,
+    supportsImages: false,
+    stage: "qualityReview",
+    envOverrideKey: "OPENROUTER_MODEL_QUALITY_REVIEW",
+  },
+} as const;
+
+function normalizeModelOverride(value: string | undefined): string | null {
+  if (typeof value !== "string") return null;
+  const trimmed = value.trim();
+  return trimmed === "" ? null : trimmed;
+}
+
+export function resolveModelProfile(
+  profileKey: ModelProfileKey,
+  env: Readonly<Record<string, string | undefined>> = process.env,
+): AiModelProfile {
+  const profile = MODEL_PROFILES[profileKey];
+  const override = normalizeModelOverride(env[profile.envOverrideKey]);
+
+  return {
+    ...profile,
+    modelId: override ?? profile.modelId,
+  };
+}
+
+export function resolveModelId(
+  profileKey: ModelProfileKey,
+  env: Readonly<Record<string, string | undefined>> = process.env,
+): string {
+  const profile = MODEL_PROFILES[profileKey];
+  const override = normalizeModelOverride(env[profile.envOverrideKey]);
+
+  return override ?? profile.modelId;
+}