feat(templates): consolidate admin and profile templates

Add admin_users.templ for user management interface with delete, password
reset, and edit capabilities. Add profile.templ and related components for
user profile management. Remove admin_profile.templ. Update all templates
to use new consolidated API endpoints.

templates/profile_modal.templ

@@ -0,0 +1,45 @@
+package templates
+
+templ ProfileModal(user User) {
+	<div id="profile-modal" class="fixed inset-0 flex items-center justify-center z-50" style="background-color: rgba(0,0,0,0.5);">
+		<div class="rounded-lg shadow-xl max-w-4xl w-full mx-4 max-h-[90vh] overflow-y-auto" style="background-color: var(--bg-secondary);">
+			<!-- Modal Header -->
+			<div class="flex justify-between items-center p-6 border-b" style="border-color: var(--border);">
+				<div>
+					<h2 class="text-2xl font-bold" style="color: var(--text-primary)">Edit User Profile</h2>
+					<p class="text-sm mt-1" style="color: var(--text-secondary);">
+						{ user.Username } ({ user.Email })
+					</p>
+				</div>
+				<button
+					onclick="closeProfileModal()"
+					class="text-2xl"
+					style="color: var(--text-secondary);"
+				>
+					&times;
+				</button>
+			</div>
+
+			<!-- Modal Body - uses reusable form -->
+			<div class="p-6">
+				@ProfileForm(user, "/api/auth/profile/" + user.ID, false, true, true)
+			</div>
+		</div>
+	</div>
+
+	<script>
+		function closeProfileModal() {
+			const modal = document.getElementById('profile-modal');
+			if (modal) {
+				modal.remove();
+			}
+		}
+
+		// Close modal on escape key
+		document.addEventListener('keydown', function(e) {
+			if (e.key === 'Escape') {
+				closeProfileModal();
+			}
+		});
+	</script>
+}