feat(pdf): move executive summary to top of report

- Reorder PDF sections to place Executive Summary first
- Executive Summary now appears immediately after header
- Added extra spacing between Executive Summary and SWOT sections
- All other sections (Strengths, Weaknesses, Opportunities, Threats) remain in same order

New structure:
1. Header
2. Executive Summary ⬆️ (moved from bottom)
3. SWOT Analysis sections (S, W, O, T)

Improves report readability by presenting key insights first.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/backend/core/pdf_service.py

@@ -298,7 +298,12 @@ class SwotPDFGenerator:
         # Header
         self._add_header(story)
 
+        # Executive Summary (placed first for prominence)
+        story.append(Spacer(1, 0.2 * inch))
+        self._add_executive_summary(story)
+
         # SWOT Categories
+        story.append(Spacer(1, 0.3 * inch))
         story.append(Paragraph("SWOT Analysis", self.styles["SectionHeader"]))
         story.append(Spacer(1, 0.15 * inch))
 
@@ -318,10 +323,6 @@ class SwotPDFGenerator:
             story, "Threats", self.analysis.threats, SWOT_THREAT
         )
 
-        # Executive Summary
-        story.append(Spacer(1, 0.2 * inch))
-        self._add_executive_summary(story)
-
         # Build PDF
         doc.build(story)