feat: add Clone Database to Docker functionality

Clone any database to a local Docker PostgreSQL container with schema
and/or data transfer via pg_dump. Supports three modes: schema only,
full clone, and sample data. Includes container lifecycle management
(start/stop/remove) in the Admin panel, progress tracking with
collapsible process log, and automatic connection creation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/src/models/connection.rs

@@ -16,6 +16,10 @@ pub struct ConnectionConfig {
 
 impl ConnectionConfig {
     pub fn connection_url(&self) -> String {
+        self.connection_url_for_db(&self.database)
+    }
+
+    pub fn connection_url_for_db(&self, database: &str) -> String {
         let ssl = self.ssl_mode.as_deref().unwrap_or("prefer");
         format!(
             "postgres://{}:{}@{}:{}/{}?sslmode={}",
@@ -23,7 +27,7 @@ impl ConnectionConfig {
             urlencoded(&self.password),
             self.host,
             self.port,
-            urlencoded(&self.database),
+            urlencoded(database),
             ssl
         )
     }