feat: v2.0.0 - Domain-based memory + multi-plugin marketplace structure

## Domain-based Memory (v2.0.0)
- Memory split into domains (backend, frontend, database, testing, deployment, global)
- Selective loading via `paths` frontmatter - only relevant memories load
- Automatic domain detection from file paths in conversation
- Auto-generated glob patterns when creating new domains
- Cross-domain analysis in /learn:reflect

## Repository Reorganization
- Restructured for multi-plugin marketplace: plugin/ → plugins/learn/
- Marketplace renamed: romfast-tools → romfast-plugins
- Repository to be renamed on Gitea: claude-learn → claude-plugins

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

plugins/learn/templates/memory-entry.json

@@ -0,0 +1,51 @@
+{
+  "pattern": {
+    "title": "",
+    "discovered": "",
+    "feature": "",
+    "domain": "",
+    "description": "",
+    "example": {
+      "file": "",
+      "lines": "",
+      "language": "",
+      "code": ""
+    },
+    "tags": []
+  },
+  "gotcha": {
+    "title": "",
+    "discovered": "",
+    "feature": "",
+    "domain": "",
+    "problem": "",
+    "solution": "",
+    "tags": []
+  },
+  "statistics": {
+    "total_patterns": 0,
+    "total_gotchas": 0,
+    "last_session": "",
+    "sessions_recorded": 0
+  },
+  "domains": {
+    "backend": {
+      "patterns": ["src/api/**/*.ts", "src/server/**/*.ts", "services/**/*"]
+    },
+    "frontend": {
+      "patterns": ["src/components/**/*.tsx", "src/pages/**/*.tsx", "**/*.css"]
+    },
+    "database": {
+      "patterns": ["src/db/**/*.ts", "migrations/**/*.ts", "**/*.sql"]
+    },
+    "testing": {
+      "patterns": ["**/*.test.ts", "**/*.spec.ts", "tests/**/*"]
+    },
+    "deployment": {
+      "patterns": ["Dockerfile", "docker-compose.yml", "**/*.yml", "infra/**/*"]
+    },
+    "global": {
+      "patterns": []
+    }
+  }
+}