feat: Add Immich app flake with docker-compose deployment

- Create Immich module as appflake in appflakes/immich/
- Module provides NixOS module for docker-compose deployment
- Includes 5-container stack:
  * immich_server: Web API and interface
  * immich_microservices: Background jobs and ML processing
  * immich_postgres: PostgreSQL with pgvector
  * immich_redis: Redis cache
  * immich_typesense: Search engine
- Configuration options for:
  * Domain and port customization
  * Data directory location
  * Database and API keys
  * Optional Watchtower auto-updates
- Automatic systemd service integration
- Comprehensive documentation in README.md
- Named module 'immich-docker' to avoid conflicts with Nixpkgs module

appflakes/immich/flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1770115704,
+        "narHash": "sha256-KHFT9UWOF2yRPlAnSXQJh6uVcgNcWlFqqiAZ7OVlHNc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e6eae2ee2110f3d31110d5c222cd395303343b08",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}