feat: add Microsoft Access database support

Add Access as a new database type with agent-based connectivity,
UCanAccess JDBC URL parsing, backtick identifier quoting, file-path
connection dialog, and PNG icons for Access/GoldenDB/Vastbase.

crates/dbx-core/src/connection.rs

@@ -239,6 +239,7 @@ impl AppState {
             | DatabaseType::Kylin
             | DatabaseType::Sundb
             | DatabaseType::Tdengine
+            | DatabaseType::Access
             | DatabaseType::Gaussdb => {
                 let mut client =
                     self.agent_manager.spawn(&db_config.db_type, db_config.driver_profile.as_deref()).await?;
@@ -437,6 +438,7 @@ pub fn agent_connect_params(config: &ConnectionConfig, host: &str, port: u16, da
         "username": config.username,
         "password": config.password,
         "url_params": config.url_params.as_deref().unwrap_or(""),
+        "connection_string": config.connection_string.as_deref().unwrap_or(""),
     })
 }
 

crates/dbx-core/src/database_capabilities.rs

@@ -25,6 +25,7 @@ pub fn agent_key(db_type: &DatabaseType, driver_profile: Option<&str>) -> Option
         DatabaseType::Gaussdb => Some("gaussdb"),
         DatabaseType::MongoDb => Some("mongodb"),
         DatabaseType::Tdengine => Some("tdengine"),
+        DatabaseType::Access => Some("access"),
         _ => None,
     }
 }
@@ -44,6 +45,7 @@ pub fn is_single_connection_pool(db_type: &DatabaseType) -> bool {
             | DatabaseType::Highgo
             | DatabaseType::Vastbase
             | DatabaseType::Goldendb
+            | DatabaseType::Access
             | DatabaseType::Jdbc
     )
 }

crates/dbx-core/src/models/connection.rs

@@ -120,6 +120,7 @@ pub enum DatabaseType {
     Vastbase,
     Goldendb,
     Gaussdb,
+    Access,
     #[serde(rename = "h2")]
     H2,
     Snowflake,
@@ -213,6 +214,7 @@ impl ConnectionConfig {
             DatabaseType::Sqlite | DatabaseType::DuckDb => {
                 format!("{}?mode=rwc", self.host)
             }
+            DatabaseType::Access => self.host.clone(),
             DatabaseType::Redis => {
                 let scheme = if self.ssl { "rediss" } else { "redis" };
                 format!("{scheme}://{host}:{port}/")
@@ -284,6 +286,7 @@ impl ConnectionConfig {
             DatabaseType::Sqlite | DatabaseType::DuckDb => {
                 format!("{}?mode=rwc", self.host)
             }
+            DatabaseType::Access => self.host.clone(),
             DatabaseType::Redis => {
                 let scheme = if self.ssl { "rediss" } else { "redis" };
                 if self.username.is_empty() && self.password.is_empty() {