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/strategic-compact/suggest-compact.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# Strategic Compact Suggester
+# Runs on PreToolUse or periodically to suggest manual compaction at logical intervals
+#
+# Why manual over auto-compact:
+# - Auto-compact happens at arbitrary points, often mid-task
+# - Strategic compacting preserves context through logical phases
+# - Compact after exploration, before execution
+# - Compact after completing a milestone, before starting next
+#
+# Configured in .cursor/hooks.json:
+#   afterFileEdit -> node .cursor/scripts/hooks/suggest-compact.js
+# This shell version is a fallback for environments without Node.
+#
+# Criteria for suggesting compact:
+# - Session has been running for extended period
+# - Large number of tool calls made
+# - Transitioning from research/exploration to implementation
+# - Plan has been finalized
+
+# Track tool call count (increment in a temp file)
+COUNTER_FILE="/tmp/claude-tool-count-$$"
+THRESHOLD=${COMPACT_THRESHOLD:-50}
+
+# Initialize or increment counter
+if [ -f "$COUNTER_FILE" ]; then
+  count=$(cat "$COUNTER_FILE")
+  count=$((count + 1))
+  echo "$count" > "$COUNTER_FILE"
+else
+  echo "1" > "$COUNTER_FILE"
+  count=1
+fi
+
+# Suggest compact after threshold tool calls
+if [ "$count" -eq "$THRESHOLD" ]; then
+  echo "[StrategicCompact] $THRESHOLD tool calls reached - consider /compact if transitioning phases" >&2
+fi
+
+# Suggest at regular intervals after threshold
+if [ "$count" -gt "$THRESHOLD" ] && [ $((count % 25)) -eq 0 ]; then
+  echo "[StrategicCompact] $count tool calls - good checkpoint for /compact if context is stale" >&2
+fi