Port 4ducky to Rust (Axum + SQLite)

Same design, layout, URLs and features as the PHP version: browse grid,
image view with AJAX comments, BBCode, likes, uploads (file, URL and
bookmarklet), quicktagger, profile, block list, inbox, invites, Hall of
Ducks, Truhe, abuse reports and the admin tools.

- Parameterized SQL, escaped templates (askama), argon2 passwords,
  server-side sessions, CSRF tokens on every write, strict script CSP
- SSRF-safe remote image fetching, magic-byte upload checks
- Self-hosted captcha replaces reCAPTCHA v1; analytics/social widgets removed
- Vanilla JS replaces jQuery and its plugins with the same DOM behaviour
- Reverse proxy support (frontend_path, trust_proxy, secure_cookies)
- Admin CLI: admin, settings, invites

See README.md for running it and the full list of changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

templates/inboxuser.html

@@ -0,0 +1,70 @@
+{% include "header.html" %}
+
+<br/><br/>
+
+<table class="duckytable" align="center" width="800px" border="0" cellspacing="0" cellpadding="0">
+
+<caption>Conversation with:</caption>
+
+<tr>
+    <td width="400px" style="border-bottom: 0;">
+
+    <div class="userInfo" style=" {{ border }}">
+	<img class="avatar" width="60" height="60" src="/{{ avatar }}"/>
+	<div class="name">
+		<strong>
+			<a href="/user/{{ name_enc }}">{{ name }}</a>
+		</strong>
+	</div>
+	<div class="info">
+		ID: <strong>{{ id }}</strong> /
+		Images: <strong>{{ images }}</strong>
+		{%- if let Some(w) = website %}/
+			<strong><a href="{{ w }}" target="_blank">
+				Website
+			</a></strong>
+		{%- endif %}
+        <br /><br />
+        </div>
+            </div>
+
+    </td>
+
+
+  </tr>
+
+</table>
+<div  align="center">
+ <div class="comment" style=" {{ border }}margin:5px; text-align:left;width:700px;color:#333">
+            <strong>Message to {{ name }}:</strong>
+            <form method="post" class="addComment" action="/inbox/{{ name_enc }}">
+					<div>
+						<input type="hidden" name="_csrf" value="{{ l.csrf }}"/>
+						<textarea name="content" rows="6" cols="93"></textarea><br />
+						<input class="submit" type="submit" name="addComment" value="Submit Message"/>
+					</div>
+				</form>
+              </div>
+
+{%- for s in messages %}
+
+				<div class="comment" style=" margin:5px; text-align:left;width:700px;{{ s.border }}">
+					<div class="commentHead">
+
+						<a href="/user/{{ s.from_enc }}">{{ s.from_name }}</a>
+						at {{ s.date }}
+
+					</div>
+
+                    <hr style=" {{ s.border }} width: 99%;">
+					{{ s.body|safe }}
+				</div>
+{%- else %}
+No messages found. <hr style="background-color:#d2d9e7;">
+{%- endfor %}
+
+
+
+
+            </div> <br/>
+{% include "footer.html" %}