Add Technical Kiwi website with Go, templ, and HTMX.

Single-page site with gallery by album and event, contact form over SMTP,
Docker dev/prod setup, and on-server image derivatives. Gallery photos stay
local (app/images/ is gitignored).

Co-authored-by: Cursor <cursoragent@cursor.com>

app/templates/contact.templ

@@ -0,0 +1,76 @@
+package templates
+
+templ ContactForm(enabled bool) {
+	<section id="contact" class="contact">
+		<h2>Contact</h2>
+		<p class="contact-intro">
+			Interested in a project or collaboration? Send a message below.
+		</p>
+		if !enabled {
+			<p class="contact-unavailable">
+				The contact form is not configured yet. Email
+				<a href="mailto:hello@technical.kiwi">hello@technical.kiwi</a>
+				directly.
+			</p>
+		} else {
+			<form
+				class="contact-form"
+				method="post"
+				action="/contact"
+				hx-post="/contact"
+				hx-target="#contact-result"
+				hx-swap="innerHTML"
+				hx-boost="false"
+				hx-disabled-elt="find button[type=submit]"
+			>
+				<div class="form-row">
+					<label for="name">Name</label>
+					<input type="text" id="name" name="name" required autocomplete="name" maxlength="120"/>
+				</div>
+				<div class="form-row">
+					<label for="email">Email</label>
+					<input type="email" id="email" name="email" required autocomplete="email" maxlength="254"/>
+				</div>
+				<div class="form-row">
+					<label for="message">Message</label>
+					<textarea id="message" name="message" required rows="6" maxlength="8000"></textarea>
+				</div>
+				<input
+					class="hp-field"
+					type="text"
+					name="website"
+					id="website"
+					tabindex="-1"
+					autocomplete="off"
+					aria-hidden="true"
+				/>
+				<button type="submit" class="btn btn-primary">Send message</button>
+			</form>
+		}
+		<div id="contact-result" class="contact-result"></div>
+	</section>
+}
+
+templ ContactSuccess() {
+	<div class="alert alert-success" role="status">
+		<p>Thanks — your message has been sent. We will get back to you soon.</p>
+	</div>
+}
+
+templ ContactValidationAlert(errs map[string]string) {
+	<div class="alert alert-error" role="alert">
+		<p>Please fix the following:</p>
+		<ul>
+			for _, msg := range errs {
+				<li>{ msg }</li>
+			}
+		</ul>
+	</div>
+}
+
+templ ContactSendError() {
+	<div class="alert alert-error" role="alert">
+		<p>Something went wrong sending your message. Please try again later or email
+			<a href="mailto:hello@technical.kiwi">hello@technical.kiwi</a>.</p>
+	</div>
+}