feat: single entry point routing — convert to front controller pattern

- Create app/public/index.php as front controller (bootstrap + Dispatcher)
- Rewrite app/router.php for PHP dev server → all non-asset requests to index.php
- Update Dispatcher to render full page layouts (head+header+view+footer)
- Move public view templates into templates/public/ (home, search, tfe, about, repertoire)
- Delete dead direct-access public/*.php files (apropos, search, tfe, licence, repertoire)
- Add clean URL routes to Dispatcher (/search, /tfe, /repertoire, /apropos, /licence, /media)
- Remove .php extensions from all internal links (header, views, templates, URLs)
- Update OG tags in controllers to use clean URLs
- Update nginx posterg.conf → front-controller try_files pattern, block direct .php access
- Update header.php and search-bar.php form actions to clean URLs
- Switch AboutController nav key from 'nav' to 'currentNav' for consistency

app/templates/public/search.php

@@ -0,0 +1,67 @@
+<?php if ($validationError): ?>
+<div class="search-error">⚠ <?= htmlspecialchars($validationError) ?></div>
+<?php endif; ?>
+
+<!-- Filter controls -->
+<form class="search-controls" method="GET" action="/search">
+    <input type="hidden" name="query" value="<?= htmlspecialchars($_GET['query'] ?? '') ?>">
+
+    <label class="search-filter-label" for="filter-year">Année
+        <select class="search-filter-select" name="year" id="filter-year">
+            <option value="">Toutes</option>
+            <?php foreach ($years as $y): ?>
+                <option value="<?= (int)$y ?>" <?= (isset($_GET['year']) && $_GET['year'] == $y) ? 'selected' : '' ?>>
+                    <?= (int)$y ?>
+                </option>
+            <?php endforeach; ?>
+        </select>
+    </label>
+
+    <label class="search-filter-label" for="filter-orientation">Orientation
+        <select class="search-filter-select" name="orientation" id="filter-orientation">
+            <option value="">Toutes</option>
+            <?php foreach ($orientations as $o): ?>
+                <option value="<?= htmlspecialchars($o['name']) ?>"
+                        <?= (isset($_GET['orientation']) && $_GET['orientation'] == $o['name']) ? 'selected' : '' ?>>
+                    <?= htmlspecialchars($o['name']) ?>
+                </option>
+            <?php endforeach; ?>
+        </select>
+    </label>
+
+    <label class="search-filter-label" for="filter-ap">AP
+        <select class="search-filter-select" name="ap_program" id="filter-ap">
+            <option value="">Tous</option>
+            <?php foreach ($apPrograms as $ap): ?>
+                <option value="<?= htmlspecialchars($ap['name']) ?>"
+                        <?= (isset($_GET['ap_program']) && $_GET['ap_program'] == $ap['name']) ? 'selected' : '' ?>>
+                    <?= htmlspecialchars($ap['name']) ?>
+                </option>
+            <?php endforeach; ?>
+        </select>
+    </label>
+
+    <button type="submit" class="search-apply-btn">Filtrer</button>
+    <a href="/search?query=<?= urlencode($_GET['query'] ?? '') ?>" class="search-reset-link">Réinitialiser</a>
+</form>
+
+<main class="search-main" id="main-content">
+    <output class="search-results-header" role="status"><?= $totalItems ?> résultat<?= $totalItems > 1 ? 's' : '' ?></output>
+
+    <?php if (!empty($results)): ?>
+    <ul class="results-grid">
+        <?php foreach ($results as $item): ?>
+        <li><a href="/tfe?id=<?= (int)$item['id'] ?>" class="result-card">
+            <span class="result-card__authors"><?= htmlspecialchars($item['authors'] ?? '') ?></span>
+            <span class="result-card__title"><?= htmlspecialchars($item['title']) ?></span>
+            <small class="result-card__meta"><?= htmlspecialchars($item['year']) ?><?php if (!empty($item['orientation'])): ?> · <?= htmlspecialchars($item['orientation']) ?><?php endif; ?></small>
+        </a></li>
+        <?php endforeach; ?>
+    </ul>
+
+    <?php include APP_ROOT . '/templates/partials/pagination.php'; ?>
+
+    <?php else: ?>
+    <p class="search-empty">Aucun résultat pour cette recherche.</p>
+    <?php endif; ?>
+</main>