feat: add Obsidian CLI API service

- Add Docker image for the official Obsidian desktop app and CLI.

- Start Obsidian headlessly with Xvfb and DBus setup.

- Expose a safe structured HTTP command API without shell execution.

- Add JWT-based vault, path, and command authorization.

- Support single-vault and multi-vault container mounts.

- Add TypeScript SDK helpers for Obsidian CLI commands.

- Add n8n community node package with Obsidian operations.

- Add docs, compose config, tests, and production image workflow.

sdk/typescript/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "@obsidian-api/sdk",
+  "version": "1.0.0",
+  "description": "TypeScript SDK for the official Obsidian CLI HTTP wrapper. Built for n8n, Prism, and other TS/Node agent harnesses.",
+  "type": "module",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "files": ["dist", "src"],
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "test": "node --test"
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "typescript": "^5.9.0"
+  }
+}