feat: adição de novos ícones SVG e configuração do ambiente

- Adicionados ícones SVG para ChatGPT, Claude, Gemini e OpenRouter
- Implementados ícones para modos claro e escuro do ChatGPT
- Criado script de inicialização para PostgreSQL com extensão pgcrypto
- Adicionado script de configuração de ambiente que faz backup do .env
- Configurado tsconfig.json para TypeScript com opções de compilação

components/calendario/utils.ts

@@ -0,0 +1,61 @@
+import type { CalendarDay, CalendarEvent } from "@/components/calendario/types";
+
+export const formatDateKey = (date: Date) => date.toISOString().slice(0, 10);
+
+export const parseDateKey = (value: string) => {
+  const [yearStr, monthStr, dayStr] = value.split("-");
+  const year = Number.parseInt(yearStr ?? "", 10);
+  const month = Number.parseInt(monthStr ?? "", 10);
+  const day = Number.parseInt(dayStr ?? "", 10);
+
+  return new Date(Date.UTC(year, (month ?? 1) - 1, day ?? 1));
+};
+
+const getWeekdayIndex = (date: Date) => {
+  const day = date.getUTCDay(); // 0 (domingo) - 6 (sábado)
+  // Ajusta para segunda-feira como primeiro dia
+  return day === 0 ? 6 : day - 1;
+};
+
+export const buildCalendarDays = ({
+  year,
+  monthIndex,
+  events,
+}: {
+  year: number;
+  monthIndex: number;
+  events: Map<string, CalendarEvent[]>;
+}): CalendarDay[] => {
+  const startOfMonth = new Date(Date.UTC(year, monthIndex, 1));
+  const offset = getWeekdayIndex(startOfMonth);
+  const startDate = new Date(Date.UTC(year, monthIndex, 1 - offset));
+  const totalCells = 42; // 6 semanas
+  const now = new Date();
+  const todayKey = formatDateKey(
+    new Date(Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()))
+  );
+
+  const days: CalendarDay[] = [];
+
+  for (let index = 0; index < totalCells; index += 1) {
+    const currentDate = new Date(startDate);
+    currentDate.setUTCDate(startDate.getUTCDate() + index);
+
+    const dateKey = formatDateKey(currentDate);
+    const isCurrentMonth = currentDate.getUTCMonth() === monthIndex;
+    const dateLabel = currentDate.getUTCDate().toString();
+    const eventsForDay = events.get(dateKey) ?? [];
+
+    days.push({
+      date: dateKey,
+      label: dateLabel,
+      isCurrentMonth,
+      isToday: dateKey === todayKey,
+      events: eventsForDay,
+    });
+  }
+
+  return days;
+};
+
+export const WEEK_DAYS_SHORT = ["Seg", "Ter", "Qua", "Qui", "Sex", "Sáb", "Dom"];