Description

This PR addresses issue #4428 where gf gen ctrl -m incorrectly generates duplicate controller methods. This happens when the controller file imports a package that shares the same version suffix as the API (e.g., v2) but uses an alias or is a different library (e.g., excelize "github.com/xuri/excelize/v2").

Problem:
When scanning existing controllers, the generator attempts to identify which methods have already been generated by matching imports against the API version. Previously, this logic was flawed:

1. It relied on simple string splitting to parse imports, which is brittle.
2. It did not correctly distinguish between the API package and other packages that might share a similar name or version suffix (like v2).

As a result, the generator would fail to recognize existing API method implementations, assume they were missing, and regenerate them, causing duplication errors.

Solution:

1. AST-Based Import Parsing: Updated genctrl_ast_parse.go to use Go's AST (go/ast) to robustly parse imports, correctly capturing both the package path and any explicit aliases.
2. Strict Alias Matching: Updated genctrl_calculate.go to utilize the parsed alias information.
   • If an import has an explicit alias, the generator now strictly compares that alias against the API version name used in the method signature.
   • If the alias does not match, the import is correctly ignored, preventing false positives (e.g., excelize aliasing .../v2 will no longer match API version v2).

Test

Added a reproduction test case Test_Gen_Ctrl_Issue4428 in cmd/gf/internal/cmd/cmd_z_unit_gen_ctrl_issue_4428_test.go:

1. Initializes a V2 API project.
2. Generates the initial controller.
3. Injects a conflicting import (excelize "github.com/xuri/excelize/v2") into the generated controller.
4. Adds a new API endpoint.
5. Runs the generator again.
6. Verifies that no duplicate methods are created for existing endpoints.

Verification:
The test passes, confirming that the generator now correctly handles aliased imports and avoids duplication.

=== RUN   Test_Gen_Ctrl_Issue4428
...
--- PASS: Test_Gen_Ctrl_Issue4428 (0.35s)
PASS