将 native/api/ 改名为 native/wndb/，避免与 Web API 层命名冲突

SECONDARY_DEVELOPMENT_GUIDE.md

@@ -276,7 +276,7 @@ TJWater integrates compiled C/Go binaries for water network simulation:
 ```
 Python (FastAPI)
     ↓
-app/native/api/
+app/native/wndb/
     ├── project.py              (list, create, delete, open projects)
     ├── s2_junctions.py         (CRUD for junctions)
     ├── s5_pipes.py             (CRUD for pipes)
@@ -290,7 +290,7 @@ app/native/api_encap/          (Low-level binary wrappers)
 
 #### 1. Native API Initialization
 ```python
-# app/native/api/__init__.py
+# app/native/wndb/__init__.py
 from app.native.api_encap.api import (
     ChangeSet,  # Change tracking
     API_ADD, API_UPDATE, API_DELETE,  # Operations
@@ -302,7 +302,7 @@ from app.native.api_encap.api import (
 #### 2. Example: Project Management
 ```python
 # app/services/tjnetwork.py
-from app.native.api import list_project, open_project, close_project
+from app.native.wndb import list_project, open_project, close_project
 
 def list_project() -> list[str]:
     """List all project databases"""
@@ -334,7 +334,7 @@ def update_junction(name: str, demand: float):
 #### 4. Network CRUD Operations
 ```python
 # All operations follow this pattern:
-from app.native.api import get_all_junctions, add_junction, set_junction
+from app.native.wndb import get_all_junctions, add_junction, set_junction
 
 # Read
 junctions = get_all_junctions()  # Returns list of dicts
@@ -357,7 +357,7 @@ app/api/v1/endpoints/simulation.py
     ↓
 app/services/simulation.py (business logic)
     ↓
-app/native/api/ (calls binary functions)
+app/native/wndb/ (calls binary functions)
     ├── open_project("szh")
     ├── set_option("QUALITY", "CHEMICAL")
     ├── run_simulation()
@@ -372,7 +372,7 @@ Response to client
 Native module exports constants for enumerations:
 
 ```python
-from app.native.api import (
+from app.native.wndb import (
     OPTION_UNITS_LPS,          # Flow units
     OPTION_PRESSURE_KPA,       # Pressure units
     OPTION_QUALITY_CHEMICAL,   # Quality type
@@ -1004,7 +1004,7 @@ services:
 | **Repository** | `app/infra/repositories/` | Data access layer | psycopg cursor |
 | **Domain** | `app/domain/` | Models & schemas | Pydantic, Enum |
 | **Services** | `app/services/` | Business logic | Python, native APIs |
-| **Native API** | `app/native/api/` | Binary integration | ctypes/cffi, .so/.dll |
+| **Native API** | `app/native/wndb/` | Binary integration | ctypes/cffi, .so/.dll |
 | **Config** | `app/core/config.py` | Settings management | Pydantic Settings |
 | **Security** | `app/core/security.py` | Encryption, hashing | cryptography, passlib |
 | **Audit** | `app/infra/audit/` | Operation logging | Middleware, Repository |