fix: remove double language prefix from article URLs

generate_articles() was storing url_path with lang prefix (/en/markets/...)
but the content blueprint is registered at /<lang>, producing double-prefix
URLs like /en/en/markets/italy. Fix: store url_path without prefix, build
full_url with prefix for SEO tags (canonical, OG, hreflang, breadcrumbs).

Also removes /markets from RESERVED_PREFIXES since article sub-paths under
/markets/ are valid pSEO content URLs, not blueprint routes.

Subtask 1 of pSEO template improvements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/padelnomics/admin/templates/admin/partials/seo_scorecard.html

@@ -69,7 +69,7 @@
       {% for a in scorecard %}
       <tr>
         <td style="max-width:250px">
-          <a href="{{ a.url_path }}" target="_blank" class="text-sm" title="{{ a.url_path }}">{{ a.title or a.url_path }}</a>
+          <a href="/{{ a.language or 'en' }}{{ a.url_path }}" target="_blank" class="text-sm" title="{{ a.url_path }}">{{ a.title or a.url_path }}</a>
           {% if a.template_slug %}
           <br><span class="text-xs text-slate">{{ a.template_slug }}</span>
           {% endif %}

web/src/padelnomics/content/__init__.py

@@ -308,8 +308,8 @@ async def generate_articles(
             # Build render context: row data + language
             ctx = {**row, "language": lang}
 
-            # Render URL pattern
-            url_path = f"/{lang}" + _render_pattern(config["url_pattern"], ctx)
+            # Render URL pattern (no lang prefix — blueprint provides /<lang>)
+            url_path = _render_pattern(config["url_pattern"], ctx)
             if is_reserved_path(url_path):
                 continue
 
@@ -375,8 +375,8 @@ async def generate_articles(
             # Extract FAQ pairs for structured data
             faq_pairs = _extract_faq_pairs(body_md)
 
-            # Build SEO metadata
-            full_url = base_url + url_path
+            # Build SEO metadata (full_url includes lang prefix for canonical/OG)
+            full_url = f"{base_url}/{lang}{url_path}"
             publish_dt = datetime(
                 publish_date.year, publish_date.month, publish_date.day,
                 8, 0, 0,
@@ -397,7 +397,7 @@ async def generate_articles(
             )
 
             # JSON-LD
-            breadcrumbs = _build_breadcrumbs(url_path, base_url)
+            breadcrumbs = _build_breadcrumbs(f"/{lang}{url_path}", base_url)
             jsonld_objects = build_jsonld(
                 config["schema_type"],
                 title=title,
@@ -499,7 +499,7 @@ async def preview_article(
 
     ctx = {**row, "language": lang}
 
-    url_path = f"/{lang}" + _render_pattern(config["url_pattern"], ctx)
+    url_path = _render_pattern(config["url_pattern"], ctx)
     title = _render_pattern(config["title_pattern"], ctx)
     meta_desc = _render_pattern(config["meta_description_pattern"], ctx)
 

web/src/padelnomics/content/routes.py

@@ -23,7 +23,7 @@ BUILD_DIR = Path("data/content/_build")
 RESERVED_PREFIXES = (
     "/admin", "/auth", "/planner", "/billing", "/dashboard",
     "/directory", "/leads", "/suppliers", "/health",
-    "/sitemap", "/static", "/markets", "/features", "/feedback",
+    "/sitemap", "/static", "/features", "/feedback",
 )
 
 SCENARIO_RE = re.compile(r'\[scenario:([a-z0-9_-]+)(?::([a-z]+))?\]')