feat: implement dynamic date calculation for projects

- Remove hardcoded startDate from La Porra project
- Add gitRepoUrl field to Project struct for dynamic date fetching
- Implement backend logic to fetch first commit date from git repositories
- Add processProjectDates function to calculate dates dynamically
- Update template to display computed dates and dynamic "Present/Presente"
- Add support for both static and git-based project start dates

When a project has a gitRepoUrl, the system automatically fetches the first
commit date from the repository. For current projects, it displays
"Present" (English) or "Presente" (Spanish) dynamically from the backend.

The La Porra project now uses git repository path for date calculation
instead of hardcoded JSON values.

internal/models/cv.go

@@ -102,14 +102,19 @@ type Language struct {
 type Project struct {
 	Title            string   `json:"title"`
 	URL              string   `json:"url"`
-	ProjectLogo      string   `json:"projectLogo,omitempty"` // Optional logo filename
+	ProjectLogo      string   `json:"projectLogo,omitempty"`  // Optional logo filename
+	GitRepoUrl       string   `json:"gitRepoUrl,omitempty"`    // Optional git repository URL for dynamic dates
 	Location         string   `json:"location"`
-	StartDate        string   `json:"startDate"`
+	StartDate        string   `json:"startDate,omitempty"`     // Optional static start date
 	Current          bool     `json:"current"`
 	MaintainedBy     string   `json:"maintainedBy,omitempty"` // Optional maintainer name (e.g., "SAP")
 	Technologies     []string `json:"technologies"`
 	ShortDescription string   `json:"shortDescription"`
 	Responsibilities []string `json:"responsibilities"`
+
+	// Computed fields (not stored in JSON)
+	ComputedStartDate string `json:"-"` // Dynamically calculated from git repo or system
+	DynamicDate       string `json:"-"` // Current date for ongoing projects
 }
 
 type Award struct {