Add new skills for backend patterns, coding standards, continuous learning, and NestJS best practices

- Introduced backend patterns skill with guidelines on API design, database optimization, and server-side best practices.
- Added coding standards skill outlining universal coding principles for TypeScript, NestJS, and Node.js development.
- Implemented continuous learning skill to automatically extract reusable patterns from Cursor sessions.
- Created NestJS best practices skill detailing architecture patterns, dependency injection, error handling, and security measures.
- Included various rules and templates for NestJS best practices to ensure production-ready applications.

.cursor/hooks/memory-persistence/pre-compact.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# PreCompact Hook - Save state before context compaction
+#
+# Runs before Claude compacts context, giving you a chance to
+# preserve important state that might get lost in summarization.
+#
+# Configured in .cursor/hooks.json:
+#   preCompact -> node .cursor/scripts/hooks/pre-compact.js
+# This shell version is a fallback for environments without Node.
+
+ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
+SESSIONS_DIR="${ROOT}/.cursor/sessions"
+COMPACTION_LOG="${SESSIONS_DIR}/compaction-log.txt"
+
+mkdir -p "$SESSIONS_DIR"
+
+# Log compaction event with timestamp
+echo "[$(date '+%Y-%m-%d %H:%M:%S')] Context compaction triggered" >> "$COMPACTION_LOG"
+
+# If there's an active session file, note the compaction
+ACTIVE_SESSION=$(ls -t "$SESSIONS_DIR"/*.tmp 2>/dev/null | head -1)
+if [ -n "$ACTIVE_SESSION" ]; then
+  echo "" >> "$ACTIVE_SESSION"
+  echo "---" >> "$ACTIVE_SESSION"
+  echo "**[Compaction occurred at $(date '+%H:%M')]** - Context was summarized" >> "$ACTIVE_SESSION"
+fi
+
+echo "[PreCompact] State saved before compaction" >&2