chore: add docker infrastructure, gists feature, attachment system, and admin CLI tools

- Add .dockerignore, Dockerfile, and docker compose targets to Makefile for containerized deployment
- Implement gists router with CRUD operations, database schema, and polymorphic comment/vote reuse
- Create attachment upload system with thumbnail generation, MIME detection, and storage path management
- Add attachments_prune CLI command to clean orphaned attachment records and files
- Introduce rate limiting middleware with 60 requests per minute window
- Add custom 404 and 500 error handlers with SEO-optimized template responses
- Extend database initialization with gists and attachments indexes plus upload site settings defaults
- Update load_comments to include attachment mapping for comment resources
- Register gists and uploads routers in main application and update AGENTS.md documentation

devplacepy/templates/gist_detail.html

@@ -0,0 +1,62 @@
+{% extends "base.html" %}
+{% block extra_head %}
+<link rel="stylesheet" href="/static/css/gists.css">
+<link rel="stylesheet" href="/static/css/post.css">
+{% endblock %}
+{% block content %}
+<div class="gist-detail-page">
+    <a href="/gists" class="back-link">&larr; Back to Gists</a>
+
+    <article class="gist-detail">
+        <div class="gist-detail-header">
+            <h1 class="gist-detail-title">{{ gist['title'] }}</h1>
+            <span class="gist-language-badge">&#x1F4DD; {{ gist['language']|capitalize }}</span>
+        </div>
+
+        <div class="gist-detail-author">
+            {% set _size = 32 %}{% set _size_class = "sm" %}{% set _user = author %}{% include "_avatar_link.html" %}
+            <div>
+                <a href="/profile/{{ author['username'] if author else '#' }}">{{ author['username'] if author else 'Unknown' }}</a>
+                {% if author and author.get('role') %}
+                <span style="font-size: 0.75rem; color: var(--text-muted);">&middot; {{ author['role'] }}</span>
+                {% endif %}
+                <span style="font-size: 0.75rem; color: var(--text-muted); margin-left: 0.5rem;">&middot; {{ time_ago }}</span>
+            </div>
+        </div>
+
+        {% if gist.get('description') %}
+        <div class="gist-detail-desc rendered-content" data-render>{{ gist['description'] }}</div>
+        {% endif %}
+
+        {% if attachments %}
+        {% include "_attachment_display.html" %}
+        {% endif %}
+
+        <div class="gist-code-block">
+            <div class="gist-code-header">
+                <span class="gist-language-name">{{ gist['language']|capitalize }}</span>
+                <button type="button" class="gist-copy-btn" data-copy="gist-code-content">Copy</button>
+            </div>
+            <pre><code id="gist-code-content" class="language-{{ gist['language'] }}">{{ gist['source_code'] }}</code></pre>
+        </div>
+
+        <div class="gist-detail-actions">
+            {% if user %}
+            <form method="POST" action="/votes/gist/{{ gist['uid'] }}" style="display:inline;">
+                <input type="hidden" name="value" value="1">
+                <button type="submit" class="gist-star-btn">&#x2606; {{ star_count }}</button>
+            </form>
+            {% endif %}
+            {% if is_owner %}
+            <form method="POST" action="/gists/delete/{{ gist['slug'] or gist['uid'] }}" style="display:inline;">
+                <button type="submit" class="gist-star-btn" data-confirm="Delete this gist?"><span class="icon">&#x1F5D1;&#xFE0F;</span>Delete</button>
+            </form>
+            {% endif %}
+        </div>
+    </article>
+
+    {% with target_uid=gist['uid'], target_type="gist" %}
+    {% include "_comment_section.html" %}
+    {% endwith %}
+</div>
+{% endblock %}