feat: v0.3.0 — standardize codebase, centralize infra, merge QR into CMS

- Enforce axum best practices across all 13 workspace crates
  (max 200 LOC/file, no comments, no unwrap, clean architecture)
- Fix domain→infrastructure dependency inversions in imphnen-iam and imphnen-dimentorin
- Extract imphnen-storage (MinIO) and imphnen-email (Lettre) as standalone crates
- Centralize all config in ENV struct: CDN_URL, CORS_ALLOWED_ORIGINS
- Centralize SMTP through imphnen-email; remove dead HackathonConfig
- Centralize database: QR crate now shares main DB pool (single DATABASE_URL)
- Rename QR users table to qr_users to avoid collision with main users table
- Merge imphnen-qr into imphnen-cms/src/qr (13 crates, down from 14)
- Restructure imphnen-hackathon flat modules into clean architecture
- Remove all stale env vars from .env.example (SurrealDB, QR_JWT, Hackathon infra)
- Fix Dockerfile to include all current workspace crates
- Bump all crate versions 0.2.0 → 0.3.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

imphnen-utils/src/generate_date.rs

@@ -1,30 +1,27 @@
-use tracing::{info};
-use chrono::{DateTime, Utc};
-
-/// Returns the current UTC date/time as an RFC3339 string.
-pub fn get_iso_date() -> String {
-    info!("get_iso_date called");
-    let now: DateTime<Utc> = Utc::now();
-    let date_str = now.to_rfc3339();
-    info!(date_str = %date_str, "get_iso_date returning RFC3339 date string");
-    date_str
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use chrono::DateTime;
-
-    #[test]
-    fn test_get_iso_date() {
-        let date_str = get_iso_date();
-        // Should be valid RFC3339
-        let parsed = DateTime::parse_from_rfc3339(&date_str);
-        assert!(parsed.is_ok());
-        // Should be recent (within last second)
-        let now = Utc::now();
-        let parsed = parsed.unwrap().with_timezone(&Utc);
-        let diff = (now - parsed).num_milliseconds().abs();
-        assert!(diff < 1000); // Within 1 second
-    }
-}
+use chrono::{DateTime, Utc};
+use tracing::info;
+
+pub fn get_iso_date() -> String {
+	info!("get_iso_date called");
+	let now: DateTime<Utc> = Utc::now();
+	let date_str = now.to_rfc3339();
+	info!(date_str = %date_str, "get_iso_date returning RFC3339 date string");
+	date_str
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use chrono::DateTime;
+
+	#[test]
+	fn test_get_iso_date() {
+		let date_str = get_iso_date();
+		let parsed = DateTime::parse_from_rfc3339(&date_str);
+		assert!(parsed.is_ok());
+		let now = Utc::now();
+		let parsed = parsed.unwrap().with_timezone(&Utc);
+		let diff = (now - parsed).num_milliseconds().abs();
+		assert!(diff < 1000);
+	}
+}