Add dedicated submission success page for crackme and writeup uploads (#30)

Instead of flashing a message and redirecting to the user profile,
uploads now show a dedicated success page that clearly indicates:
- The submission was successful
- It needs to be reviewed before becoming publicly available

This addresses the UX issue where the success message was not very
visible on the profile page.

Closes #4

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: xusheng6

app/controllers/crackme.py

@@ -65,6 +65,12 @@ def crackme_view(hexid):
                            quality=f"{crackme.get('quality', 0):.1f}")
 
 
+@crackme_bp.route('/lasts')
+def last_crackmes_redirect():
+    """Redirect /lasts to /lasts/1."""
+    return redirect('/lasts/1')
+
+
 @crackme_bp.route('/lasts/<int:page>')
 def last_crackmes_page(page):
     """Display latest crackmes with pagination."""
@@ -239,5 +245,7 @@ def upload_crackme_post():
     except Exception as e:
         print(f"Discord notification error: {e}")
 
-    flash('Crackme uploaded! Should be available soon.', FLASH_SUCCESS)
-    return redirect(f'/user/{username}')
+    return render_template('submission/success.html',
+                           submission_type='Crackme',
+                           name=crackme['name'],
+                           username=username)

app/controllers/solution.py

@@ -124,5 +124,7 @@ def upload_solution_post(hexidcrackme):
     except Exception as e:
         print(f"Notification error: {e}")
 
-    flash('Solution uploaded! Should be available soon.', FLASH_SUCCESS)
-    return redirect(f'/user/{username}')
+    return render_template('submission/success.html',
+                           submission_type='Writeup',
+                           name=crackme['name'],
+                           username=username)

templates/submission/success.html

@@ -0,0 +1,30 @@
+{% extends "base.html" %}
+{% block title %}Submission Successful{% endblock %}
+{% block page_title %}Submission Successful{% endblock %}
+{% block head %}{% endblock %}
+{% block content %}
+
+<div class="container grid-lg wrapper">
+    <div class="empty">
+        <div class="empty-icon">
+            <i class="icon icon-check" style="font-size: 3rem; color: #32b643;"></i>
+        </div>
+        <p class="empty-title h3">{{ submission_type }} Uploaded Successfully!</p>
+        <p class="empty-subtitle">
+            Your {{ submission_type|lower }} <strong>"{{ name }}"</strong> has been submitted.<br>
+            It will be reviewed by our team before becoming publicly available.
+        </p>
+        <div class="empty-action">
+            <a href="/user/{{ username }}" class="btn btn-primary">View Your Profile</a>
+            {% if submission_type == 'Crackme' %}
+            <a href="/upload/crackme" class="btn btn-primary">Upload Another Crackme</a>
+            {% else %}
+            <a href="/lasts/1" class="btn btn-primary">Browse Crackmes</a>
+            {% endif %}
+        </div>
+    </div>
+</div>
+
+{% include 'partial/footer.html' %}
+{% endblock %}
+{% block foot %}{% endblock %}