Add comprehensive code review specifications and templates

- Introduced best practices requirements specification covering code quality, performance, maintainability, error handling, and documentation standards.
- Established quality standards with overall quality metrics and mandatory checks for security, code quality, performance, and maintainability.
- Created security requirements specification aligned with OWASP Top 10 and CWE Top 25, detailing checks and patterns for common vulnerabilities.
- Developed templates for documenting best practice findings, security findings, and generating reports, including structured markdown and JSON formats.
- Updated dependencies in the project, ensuring compatibility and stability.
- Added test files and README documentation for vector indexing tests.

.claude/skills/code-reviewer/phases/03-best-practices-review.md

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+# Phase 3: Best Practices Review
+
+## Objective
+
+Analyze code for best practices violations including code quality, performance issues, and maintainability concerns.
+
+## Input
+
+- **File Inventory**: From Phase 1 (`.code-review/inventory.json`)
+- **Security Findings**: From Phase 2 (`.code-review/security-findings.json`)
+- **User Arguments**:
+  - `--focus best-practices`: Best practices only mode
+  - `--check quality,performance,maintainability`: Specific areas to check
+
+## Process
+
+### Step 1: Code Quality Analysis
+
+Check naming conventions, function complexity, code duplication, and dead code detection.
+
+### Step 2: Performance Analysis
+
+Detect N+1 queries, inefficient algorithms, and memory leaks.
+
+### Step 3: Maintainability Analysis
+
+Check documentation coverage, test coverage, and dependency management.
+
+## Output
+
+- best-practices-findings.json
+- Markdown report with recommendations
+
+## Next Phase
+
+**Phase 4: Report Generation**