Extract inline CSS/JS, add EJS templates with shared layout

- Extract CSS into public/css/{shared,players,courses}.css
- Extract JS into public/js/{chart,tooltips,progress,players,courses}.js
- Consolidate 5 duplicated tooltip blocks into setupTooltip() helper
- Add EJS view engine with layout partial and nav partial
- Convert HTML pages to EJS templates (index.ejs, courses.ejs)
- Add /courses route with redirect from /courses.html
- Remove old monolithic HTML files (1478 + 612 lines)

views/pages/courses.ejs

@@ -0,0 +1,31 @@
+<% var body = `
+        <div class="search-container">
+            <input
+                type="text"
+                class="search-input"
+                id="course-search"
+                placeholder="Search courses by name or city..."
+                oninput="searchCourses()"
+            />
+        </div>
+        <div id="search-results-info" class="search-results-info"></div>
+
+        <div class="controls">
+            <button class="btn" onclick="scrapeCourses()" id="scrape-courses-btn">
+                <i class="fas fa-sync-alt"></i> Scrape Courses
+            </button>
+        </div>
+
+        <div id="loading" class="loading" style="display: none;">Loading courses...</div>
+        <div id="courses-table"></div>
+`; %>
+
+<%- include('../partials/layout', {
+    title: 'PDGA Courses - Sweden',
+    heading: 'PDGA Courses - Sweden',
+    activePage: 'courses',
+    cssFiles: ['courses.css'],
+    jsFiles: ['courses.js'],
+    initScript: 'loadCourses();',
+    body: body
+}) %>