feat: add Linkwarden bookmark manager stack

Added new Links stack to Falcon infrastructure:

**Links Stack (links.pivoine.art):**
- Linkwarden bookmark manager with PostgreSQL backend
- Meilisearch v1.12.8 for full-text search
- Browser extension support
- Screenshot and PDF archiving
- Collaborative bookmark sharing

**Infrastructure Updates:**
- Created links/compose.yaml with linkwarden and meilisearch services
- Added linkwarden database to PostgreSQL init script
- Added LINKS_* environment variables to arty.yml
- Updated compose.yaml to include links stack
- Cleaned up .env to contain only secrets
- Added all EMAIL_* variables to .env

**Documentation:**
- Updated CLAUDE.md with Links service details
- Updated README.md with Links in CORE SYSTEMS table
- Added linkwarden_data and meili_data volumes to docs

**Required Secrets (in .env):**
- LINKS_NEXTAUTH_SECRET: NextAuth.js session encryption
- LINKS_MEILI_MASTER_KEY: Meilisearch API authentication

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

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

README.md

@@ -51,6 +51,7 @@ The **Falcon** is a state-of-the-art containerized starship, powered by Docker's
 | **SCRAPY** | *Web scraping reconnaissance cluster* | [scrapy.pivoine.art](https://scrapy.pivoine.art) |
 | **N8N** | *Automated workflow command center* | [n8n.pivoine.art](https://n8n.pivoine.art) |
 | **STASH** | *Universal file management portal* | [stash.pivoine.art](https://stash.pivoine.art) |
+| **LINKS** | *Interstellar bookmark archive* | [links.pivoine.art](https://links.pivoine.art) |
 | **VPN** | *Cloaking device network* | [vpn.pivoine.art](https://vpn.pivoine.art) |
 
 ### ⚙️ INFRASTRUCTURE
@@ -65,7 +66,8 @@ The **Falcon** is a state-of-the-art containerized starship, powered by Docker's
 │  💾 POSTGRESQL 16 DATA CORE                    │
 │  ├─ Directus Sector Database                   │
 │  ├─ Umami Analytics Vault                      │
-│  └─ n8n Workflow Engine Database               │
+│  ├─ n8n Workflow Engine Database               │
+│  └─ Linkwarden Bookmark Archive                │
 ├─────────────────────────────────────────────────┤
 │  ⚡ REDIS CACHE HYPERDRIVE                     │
 │  └─ Warp-speed data acceleration               │
@@ -164,6 +166,7 @@ THE FALCON (falcon_network)
 │  ├─ Scrapyd Cluster    [scrapy.pivoine.art]
 │  ├─ n8n Workflows      [n8n.pivoine.art]
 │  ├─ Filestash Files    [stash.pivoine.art]
+│  ├─ Linkwarden Marks   [links.pivoine.art]
 │  └─ WireGuard VPN      [vpn.pivoine.art]
 │
 └─ 💾 STORAGE VOLUMES
@@ -175,6 +178,8 @@ THE FALCON (falcon_network)
    ├─ scrapy_code        → Spider project code
    ├─ n8n_data           → Workflow configurations
    ├─ filestash_data     → File manager state
+   ├─ linkwarden_data    → Bookmark archives
+   ├─ meili_data         → Search index database
    └─ letsencrypt_data   → Shield certificates
 ```