update documentation with info about RPC server

RPC_COMMANDS.md

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+# HeroDB RPC Commands
+
+HeroDB provides a JSON-RPC 2.0 interface for database management operations. The RPC server runs on a separate port (default 8080) and can be enabled with the `--enable-rpc` flag.
+
+All RPC methods are prefixed with the namespace `herodb`.
+
+## Available Commands
+
+### herodb_listDatabases
+Lists all database indices that exist.
+
+**Example:**
+```bash
+curl -X POST http://localhost:8080 \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "method": "herodb_listDatabases", "id": 1}'
+```
+
+### herodb_createDatabase
+Creates a new database at the specified index.
+
+**Parameters:**
+- `db_index` (number): Database index to create
+
+**Example:**
+```bash
+curl -X POST http://localhost:8080 \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "method": "herodb_createDatabase", "params": [1], "id": 1}'
+```
+
+### herodb_getDatabaseInfo
+Retrieves detailed information about a specific database.
+
+**Parameters:**
+- `db_index` (number): Database index
+
+**Example:**
+```bash
+curl -X POST http://localhost:8080 \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "method": "herodb_getDatabaseInfo", "params": [0], "id": 1}'
+```
+
+### herodb_configureDatabase
+Configures an existing database with specific settings.
+
+**Parameters:**
+- `db_index` (number): Database index
+- `config` (object): Configuration object
+
+**Example:**
+```bash
+curl -X POST http://localhost:8080 \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "method": "herodb_configureDatabase", "params": [0, {"name": "test", "max_size": 1048576}], "id": 1}'
+```
+
+### herodb_setDatabaseEncryption
+Sets encryption for a specific database index.
+
+**Parameters:**
+- `db_index` (number): Database index
+- `encryption_key` (string): Encryption key
+
+**Example:**
+```bash
+curl -X POST http://localhost:8080 \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "method": "herodb_setDatabaseEncryption", "params": [10, "my-secret-key"], "id": 1}'
+```
+
+### herodb_deleteDatabase
+Deletes a database and its files.
+
+**Parameters:**
+- `db_index` (number): Database index to delete
+
+**Example:**
+```bash
+curl -X POST http://localhost:8080 \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "method": "herodb_deleteDatabase", "params": [1], "id": 1}'
+```
+
+### herodb_getServerStats
+Retrieves server statistics.
+
+**Example:**
+```bash
+curl -X POST http://localhost:8080 \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "method": "herodb_getServerStats", "id": 1}'