feat: Optimisation performance (Async DB) et Ajout Rapport Analyse

- Passage des requêtes DB en asynchrone dans improved_search_service pour éviter le blocage de l'Event Loop.
- Ajout du Rapport d'Analyse Technique complet.
- Sécurisation CORS (best effort).
- Ajout Walkthrough et Implementation Plan.

_bmad/bmb/workflows/create-module/templates/workflow-plan-template.md

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+# Workflow Plan Template
+
+Use this template when creating workflow plans in step-07-workflows.md
+
+## Template Structure
+
+Copy the content from step-07-workflows.md when creating workflow plans. The template is embedded in the step file as a code block under "Workflow plan template".
+
+## Usage
+
+1. Navigate to the workflow folder
+2. Create workflow-plan.md
+3. Use the template structure from step-07-workflows.md
+4. Fill in details specific to your workflow
+
+## Required Sections
+
+- Purpose
+- Requirements (User Inputs, Prerequisites, Dependencies)
+- Proposed Steps
+- Expected Outputs
+- Integration Points
+- Implementation Notes