feat: Add systemPromptMappings Configuration Feature (#108)

* feat: update system prompt for qwen3-coder

* feat: add default systemPromptMappings for Qwen models

- Add default systemPromptMappings configuration for qwen3-coder-plus model
- Support DashScope compatible mode API endpoints
- Include Qwen coder system prompt template with git repository and sandbox placeholders
- Add comprehensive test coverage for default and custom systemPromptMappings
- Update documentation to reflect the new default configuration behavior
- Ensure backward compatibility with existing user configurations

* feat: remove default system prompt template

* fix: test ci

* feat: handle code indentation issues

* feat: update prompt.test.snapshots

* feat: add URL trailing slash compatibility for system prompt mappings

- Add normalizeUrl() function to standardize URLs by removing trailing slashes
- Add urlMatches() function to compare URLs ignoring trailing slash differences
- Replace direct includes() comparison with urlMatches() for baseUrl matching
- Add comprehensive tests to verify URL matching with/without trailing slashes
- Fixes issue where URLs like 'https://api.example.com' and 'https://api.example.com/' were treated as different

* feat: update code

packages/core/src/config/config.ts

@@ -154,6 +154,11 @@ export interface ConfigParameters {
     temperature?: number;
     max_tokens?: number;
   };
+  systemPromptMappings?: Array<{
+    baseUrls?: string[];
+    modelNames?: string[];
+    template?: string;
+  }>;
 }
 
 export class Config {
@@ -204,6 +209,11 @@ export class Config {
     temperature?: number;
     max_tokens?: number;
   };
+  private readonly systemPromptMappings?: Array<{
+    baseUrls?: string[];
+    modelNames?: string[];
+    template?: string;
+  }>;
   private modelSwitchedDuringSession: boolean = false;
   private readonly maxSessionTurns: number;
   private readonly listExtensions: boolean;
@@ -258,6 +268,7 @@ export class Config {
     this.ideMode = params.ideMode ?? false;
     this.enableOpenAILogging = params.enableOpenAILogging ?? false;
     this.sampling_params = params.sampling_params;
+    this.systemPromptMappings = params.systemPromptMappings;
 
     if (params.contextFileName) {
       setGeminiMdFilename(params.contextFileName);
@@ -540,6 +551,16 @@ export class Config {
     return this.enableOpenAILogging;
   }
 
+  getSystemPromptMappings():
+    | Array<{
+        baseUrls?: string[];
+        modelNames?: string[];
+        template?: string;
+      }>
+    | undefined {
+    return this.systemPromptMappings;
+  }
+
   async refreshMemory(): Promise<{ memoryContent: string; fileCount: number }> {
     const { memoryContent, fileCount } = await loadServerHierarchicalMemory(
       this.getWorkingDir(),