Rebuild extraction pipeline infrastructure (Faza 0 prep)

Implements the approved plan to replace the broken regex/index-master
extraction with an LLM-subagent pipeline. Four parallel lanes:

Lane A — scripts/extract_common.py (PDF/docx/doc/pptx/html/zip, no
  max_pages truncation), normalize_sources.py, chunk_sources.py
  (~20pg chunks + overlap, manifest registry), activity_schema.json.
Lane B — app/config_taxonomy.py (16 fixed category slugs), schema
  rebuilt from scratch in app/models/ with content_type, language,
  source_files, source_excerpt, normalized_name, extraction_confidence,
  needs_review; FTS5 + 3 triggers extended with materials_list and
  skills_developed.
Lane C — build_database.py (--rebuild, atomic swap, schema + fuzzy
  source_excerpt validation, dedup with needs_review band),
  validate_extractions.py, review_queue.py, new run_extraction.py
  orchestrator, SUBAGENT_PROMPT.md.
Lane D — search.py content_type/language filters (default search
  excludes non-game content), E7 schema-compat audit; fixed a NULL
  keywords AttributeError in _boost_search_relevance.

Removes 8 orphaned/dead scripts and app/services/parser.py +
indexer.py. Adds tests/ (70 passing, 1 skipped — libreoffice absent).

Note: Lane D made one additive edit to app/models/database.py
(_update_category_counts) to surface content_type/language in
get_filter_options, outside its nominal lane boundary but after
Lane B completed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/web/routes.py

@@ -7,11 +7,17 @@ from flask import Blueprint, request, render_template, jsonify, current_app
 from app.models.database import DatabaseManager
 from app.models.activity import Activity
 from app.services.search import SearchService
+from app.config_taxonomy import CATEGORIES, CONTENT_TYPES
 import os
 from pathlib import Path
 
 bp = Blueprint('main', __name__)
 
+# Slug -> Romanian display name. Category and content_type slugs never collide,
+# so a single flat map is enough for the UI filter labels.
+LANGUAGE_NAMES = {'ro': 'Română', 'en': 'Engleză'}
+DISPLAY_NAMES = {**CATEGORIES, **CONTENT_TYPES, **LANGUAGE_NAMES}
+
 # Initialize database manager (will be configured in application factory)
 def get_db_manager():
     """Get database manager instance"""
@@ -36,15 +42,17 @@ def index():
         # Get database statistics for the interface
         stats = db.get_statistics()
         
-        return render_template('index.html', 
+        return render_template('index.html',
                              filters=filter_options,
+                             display_names=DISPLAY_NAMES,
                              stats=stats)
-    
+
     except Exception as e:
         print(f"Error loading main page: {e}")
         # Fallback with empty filters
-        return render_template('index.html', 
+        return render_template('index.html',
                              filters={},
+                             display_names=DISPLAY_NAMES,
                              stats={'total_activities': 0})
 
 @bp.route('/search', methods=['GET', 'POST'])
@@ -82,8 +90,9 @@ def search():
                              search_query=search_query,
                              applied_filters=filters,
                              filters=filter_options,
+                             display_names=DISPLAY_NAMES,
                              results_count=len(activities))
-    
+
     except Exception as e:
         print(f"Search error: {e}")
         return render_template('results.html',
@@ -91,6 +100,7 @@ def search():
                              search_query='',
                              applied_filters={},
                              filters={},
+                             display_names=DISPLAY_NAMES,
                              results_count=0,
                              error=str(e))
 
@@ -121,6 +131,7 @@ def activity_detail(activity_id):
         
         return render_template('activity.html',
                              activity=activity,
+                             display_names=DISPLAY_NAMES,
                              similar_activities=similar_activities)
     
     except Exception as e: