Improve handling of external proxy configurations and session security

Introduces `TRUST_PROXY_HTTPS` environment variable and updates session cookie security logic in `app.ts`. Modifies `README.md` and `docker-compose.yml` for clarity on proxy configurations. Updates `seed.ts` to conditionally seed demo meetings based on `SEED_DEMO_MEETINGS` environment variable.

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scripts/src/seed.ts

@@ -646,13 +646,26 @@ async function main() {
     }
   }
 
-  // Executive meetings: sample data for today (idempotent per-date)
+  // Executive meetings: sample data for today (idempotent per-date).
+  //
+  // Opt-in only — a vanilla self-hosted install should start with an
+  // empty Executive Meetings module. Set `SEED_DEMO_MEETINGS=true` in
+  // your environment when bootstrapping a demo / staging deploy that
+  // benefits from realistic-looking sample data.
+  const seedDemoMeetings =
+    (process.env.SEED_DEMO_MEETINGS ?? "").toLowerCase() === "true";
   const today = new Date().toISOString().slice(0, 10);
-  const existingForToday = await db
-    .select({ id: executiveMeetingsTable.id })
-    .from(executiveMeetingsTable)
-    .where(eq(executiveMeetingsTable.meetingDate, today));
-  if (existingForToday.length === 0) {
+  const existingForToday = seedDemoMeetings
+    ? await db
+        .select({ id: executiveMeetingsTable.id })
+        .from(executiveMeetingsTable)
+        .where(eq(executiveMeetingsTable.meetingDate, today))
+    : [];
+  if (!seedDemoMeetings) {
+    console.log(
+      "Executive Meetings demo data skipped (set SEED_DEMO_MEETINGS=true to enable)",
+    );
+  } else if (existingForToday.length === 0) {
     {
     const sampleMeetings: Array<{
       meeting: {