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-email/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "imphnen-email"
+version = "0.3.0"
+edition = "2024"
+
+[dependencies]
+imphnen-libs.workspace = true
+lettre.workspace = true
+tracing.workspace = true

imphnen-email/src/error.rs

@@ -0,0 +1,20 @@
+use std::fmt;
+
+#[derive(Debug)]
+pub enum EmailError {
+	SmtpConfig(String),
+	MessageBuild(String),
+	Transport(String),
+}
+
+impl fmt::Display for EmailError {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		match self {
+			EmailError::SmtpConfig(msg) => write!(f, "SMTP configuration error: {msg}"),
+			EmailError::MessageBuild(msg) => write!(f, "Message building error: {msg}"),
+			EmailError::Transport(msg) => write!(f, "SMTP transport error: {msg}"),
+		}
+	}
+}
+
+impl std::error::Error for EmailError {}

imphnen-email/src/lib.rs

@@ -0,0 +1,5 @@
+pub mod error;
+pub mod service;
+
+pub use error::EmailError;
+pub use service::send_email;

imphnen-email/src/service.rs

@@ -0,0 +1,48 @@
+use imphnen_libs::{ENV, Env};
+use lettre::message::Mailbox;
+use lettre::transport::smtp::authentication::Credentials;
+use lettre::{Message, SmtpTransport, Transport};
+use std::error::Error;
+
+use crate::error::EmailError;
+
+pub fn send_email(
+	to: &str,
+	subject: &str,
+	body: &str,
+) -> Result<(), Box<dyn Error>> {
+	let env = &ENV;
+	let message = build_message(to, subject, body, env)?;
+	let mailer = build_transport(env)?;
+	mailer.send(&message).map_err(|e| {
+		tracing::error!("Failed to send email to {}: {}", to, e);
+		Box::new(EmailError::Transport(e.to_string())) as Box<dyn Error>
+	})?;
+	tracing::info!("Email sent to: {}", to);
+	Ok(())
+}
+
+fn build_message(
+	to: &str,
+	subject: &str,
+	body: &str,
+	env: &Env,
+) -> Result<Message, Box<dyn Error>> {
+	let sender_name = env.smtp_name.replace("-", " ");
+	Message::builder()
+		.from(Mailbox::new(Some(sender_name), env.smtp_email.parse()?))
+		.to(to.parse()?)
+		.subject(subject)
+		.body(body.to_string())
+		.map_err(|e| Box::new(EmailError::MessageBuild(e.to_string())) as Box<dyn Error>)
+}
+
+fn build_transport(env: &Env) -> Result<SmtpTransport, Box<dyn Error>> {
+	let credentials =
+		Credentials::new(env.smtp_email.clone(), env.smtp_password.replace("-", " "));
+	Ok(
+		SmtpTransport::relay(&env.smtp_host)?
+			.credentials(credentials)
+			.build(),
+	)
+}