feat(i18n): register Brazilian Portuguese as a locale

Add pt-BR to the locale list and everything that hangs off it: the
client loader, Intl and date-fns mapping, the reply-language footers of
the Coach and insights prompts (English body, pt-BR footer, the same
path Korean and Dutch take), the citation-coverage normative words, the
no-key fallback copy, the AUDIT-C standard-drink line, country labels,
period search, CSV yes/no cells and the Telegram bare-word aliases.

The locale enums in the extract, managed-profile and record-settings
schemas now derive from the locale list instead of repeating it, and
the five notification and login-alert routes share one isLocale guard
instead of hand-rolled chains, so a later locale is one edit there.
A language tag is matched exactly and case-insensitively before its
primary subtag, so pt-BR and pt-PT browsers land on the Portuguese
bundle rather than English, and AUDIT-C no longer cuts a region tag to
two letters.

PHQ-9, GAD-7 and WHO-5 are not marked validated for pt-BR: the wording
has not been read against the published Brazilian forms, so readers get
the English items plus the existing note.

src/lib/ai/__tests__/citation-coverage-logging.test.ts

@@ -254,6 +254,7 @@ describe("normative-claim detection across the shipped locales", () => {
     pl: "Ciśnienie skurczowe powinno pozostać poniżej celu 130 mmHg.",
     nl: "Je bovendruk zou onder de streefwaarde van 130 mmHg moeten blijven.",
     ko: "수축기 혈압은 목표인 130 mmHg 아래로 유지해야 해요.",
+    "pt-BR": "Sua sistólica deveria ficar abaixo da meta de 130 mmHg.",
   };
 
   /**
@@ -270,6 +271,8 @@ describe("normative-claim detection across the shipped locales", () => {
     pl: "Twoja średnia z 7 dni przekracza medianę z 90 dni o 4 mmHg.",
     nl: "Je 7-daagse gemiddelde ligt 4 mmHg hoger dan je 90-daagse mediaan.",
     ko: "7일 평균이 90일 중앙값보다 4 mmHg 더 커요.",
+    "pt-BR":
+      "Sua média de 7 dias está 4 mmHg mais alta que a sua mediana de 90 dias.",
   };
 
   it.each(locales)("carries a non-empty keyword bank for %s", (locale) => {

src/lib/ai/citation-coverage.ts

@@ -162,6 +162,22 @@ const NORMATIVE_KEYWORDS: Record<Locale, readonly string[]> = {
     "초과",
     "미만",
   ],
+  // "meta" alone would also open "metabolismo" and "metade", so the goal noun
+  // is spelled with its preposition.
+  "pt-BR": [
+    "meta de",
+    "metas de",
+    "alvo",
+    "objetivo",
+    "deveria",
+    "deve ser",
+    "devem ser",
+    "faixa normal",
+    "acima d",
+    "abaixo d",
+    "superior a",
+    "inferior a",
+  ],
 };
 
 /**

src/lib/ai/coach/__tests__/system-prompt-contract-parity.test.ts

@@ -24,7 +24,17 @@ import type { Locale } from "@/lib/i18n/config";
  *    translated) and only ever appears inside the dose-safety contract.
  */
 
-const ALL_LOCALES: Locale[] = ["de", "en", "fr", "es", "it", "pl", "ko", "nl"];
+const ALL_LOCALES: Locale[] = [
+  "de",
+  "en",
+  "fr",
+  "es",
+  "it",
+  "pl",
+  "ko",
+  "nl",
+  "pt-BR",
+];
 
 describe("resolved Coach system prompt — grounding + GLP-1 per locale", () => {
   for (const locale of ALL_LOCALES) {

src/lib/ai/coach/system-prompt.ts

@@ -1258,6 +1258,8 @@ const LOCALE_REPLY_FOOTER_FALLBACK: Record<
   pl: "\n\nREPLY LANGUAGE: respond in Polish. Mirror the user's register (formal Pan/Pani for medical-adjacent topics); use natural Polish health vocabulary.",
   nl: "\n\nREPLY LANGUAGE: respond in Dutch. Use the informal je/jij register throughout (never formal u); use natural Dutch health vocabulary.",
   ko: "\n\nREPLY LANGUAGE: respond in Korean. Use the 해요체 register throughout (never 합쇼체 or plain 한다체); use natural Korean health vocabulary.",
+  "pt-BR":
+    "\n\nREPLY LANGUAGE: respond in Brazilian Portuguese (pt-BR, never European Portuguese). Address the user as você throughout; use natural Brazilian health vocabulary.",
 };
 
 /**
@@ -1295,8 +1297,8 @@ export function getCoachSystemPrompt(
     base = COACH_PROMPT_DE;
   } else if (locale === "en") {
     base = COACH_PROMPT_EN;
-  } else if (locale === "ko" || locale === "nl") {
-    // ko and nl ship no safety-contract matrix, so they are not a
+  } else if (locale === "ko" || locale === "nl" || locale === "pt-BR") {
+    // ko, nl and pt-BR ship no safety-contract matrix, so they are not a
     // NativeCoachLocale.
     base = COACH_PROMPT_EN + LOCALE_REPLY_FOOTER_FALLBACK[locale];
   } else {

src/lib/ai/prompts/__tests__/drug-level-refusal.probe.test.ts

@@ -57,6 +57,7 @@ const DRUG_LEVEL_CONCEPT_TOKENS: Record<Locale, readonly string[]> = {
   it: ["livello", "concentrazione", "picco", "valle", "Cmax", "terapeutica"],
   pl: ["poziom", "stężeni", "szczyt", "minimum", "Cmax", "terapeutyczn"],
   nl: ["spiegel", "concentratie", "piek", "dal", "Cmax", "therapeutisch"],
+  "pt-BR": ["nível", "concentração", "pico", "vale", "Cmax", "terapêutic"],
   ko: ["농도", "혈중", "최고", "최저", "Cmax", "치료"],
 };
 

src/lib/ai/prompts/__tests__/output-language-contract.test.ts

@@ -41,6 +41,7 @@ const EXPECTED_LANGUAGE_NAME: Record<Locale, string> = {
   pl: "Polish",
   nl: "Dutch",
   ko: "Korean",
+  "pt-BR": "Brazilian Portuguese",
 };
 
 /** Which body each locale is expected to compose. */
@@ -53,6 +54,7 @@ const EXPECTED_BODY: Record<Locale, "de" | "en"> = {
   pl: "en",
   nl: "en",
   ko: "en",
+  "pt-BR": "en",
 };
 
 describe("output-language helper", () => {

src/lib/ai/prompts/insight-generator.ts

@@ -994,6 +994,8 @@ const INSIGHTS_LOCALE_REPLY_FOOTER_FALLBACK: Record<
   pl: "\n\nREPLY LANGUAGE: render all user-facing strings in Polish. Use natural Polish health vocabulary with formal Pan/Pani register for medical-adjacent topics. The severity / sourceWindow / sourceMetric / topic enum values stay in lowercase English exactly as listed in OUTPUT FORMAT — those are contract keys, NOT translations.",
   nl: "\n\nREPLY LANGUAGE: render all user-facing strings in Dutch, in the informal je/jij register throughout (never formal u). Use natural Dutch health vocabulary. The severity / sourceWindow / sourceMetric / topic enum values stay in lowercase English exactly as listed in OUTPUT FORMAT — those are contract keys, NOT translations.",
   ko: "\n\nREPLY LANGUAGE: render all user-facing strings in Korean, in the 해요체 register throughout (never 합쇼체 or plain 한다체). Use natural Korean health vocabulary. The severity / sourceWindow / sourceMetric / topic enum values stay in lowercase English exactly as listed in OUTPUT FORMAT — those are contract keys, NOT translations.",
+  "pt-BR":
+    "\n\nREPLY LANGUAGE: render all user-facing strings in Brazilian Portuguese (pt-BR, never European Portuguese), addressing the user as você throughout. Use natural Brazilian health vocabulary. The severity / sourceWindow / sourceMetric / topic enum values stay in lowercase English exactly as listed in OUTPUT FORMAT — those are contract keys, NOT translations.",
 };
 
 /**
@@ -1003,9 +1005,9 @@ const INSIGHTS_LOCALE_REPLY_FOOTER_FALLBACK: Record<
 export function getStrictInsightsSystemPrompt(locale: Locale): string {
   if (locale === "de") return SYSTEM_PROMPT_DE;
   if (locale === "en") return SYSTEM_PROMPT_EN;
-  // ko and nl ship no safety-contract matrix, so they are not a
+  // ko, nl and pt-BR ship no safety-contract matrix, so they are not a
   // NativeCoachLocale.
-  if (locale === "ko" || locale === "nl") {
+  if (locale === "ko" || locale === "nl" || locale === "pt-BR") {
     return SYSTEM_PROMPT_EN + INSIGHTS_LOCALE_REPLY_FOOTER_FALLBACK[locale];
   }
   try {

src/lib/ai/prompts/output-language.ts

@@ -58,6 +58,8 @@ export function targetLanguageName(locale: Locale): string {
       return "Korean";
     case "nl":
       return "Dutch";
+    case "pt-BR":
+      return "Brazilian Portuguese";
     default:
       return "English";
   }