Update create contract page to use dynamic templates (#29)

* feat: Add contract type templates API endpoint

Add a new API endpoint to provide contract type templates (workflow
definitions) separate from file templates. This enables the create
contract page to dynamically show available contract types.

Changes:
- Add ContractTypeTemplate struct in templates.rs with id, name,
  description, phases, default_phase, and is_builtin fields
- Add built-in contract types: 'simple' (plan/execute) and
  'specification' (research/specify/plan/execute/review)
- Add GET /api/v1/contract-types endpoint returning all contract types
- Add frontend ContractTypeTemplate interface and listContractTypes()
  API function

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat: Update create contract modal to use dynamic templates

- Add ContractTypeTemplate interface and listContractTypes API function
  to frontend api.ts
- Add GET /api/v1/contract-types backend endpoint that returns built-in
  contract types (simple, specification) with their phases and defaults
- Update create contract modal to fetch contract types dynamically when
  opened, with loading state and fallback to hardcoded types on error
- Dynamically render contract type selection buttons from fetched types
- Update phase dropdown to use phases from selected contract type
- Replace static getValidPhases/getDefaultPhase calls with dynamic data

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/makima/src/server/handlers/templates.rs b/makima/src/server/handlers/templates.rs
index 868d5b4..5cad44f 100644
--- a/makima/src/server/handlers/templates.rs
+++ b/makima/src/server/handlers/templates.rs
@@ -5,6 +5,77 @@ use serde::{Deserialize, Serialize};
 use utoipa::ToSchema;
 
 use crate::llm::templates;
+use crate::llm::templates::ContractTypeTemplate;
+
+// =============================================================================
+// Contract Type Templates
+// =============================================================================
+
+/// Contract type template for API response
+#[derive(Debug, Serialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct ContractTypeTemplate {
+    /// Template identifier (e.g., "simple", "specification")
+    pub id: String,
+    /// Display name
+    pub name: String,
+    /// Description of the contract type workflow
+    pub description: String,
+    /// Ordered list of phases for this contract type
+    pub phases: Vec<String>,
+    /// Default starting phase
+    pub default_phase: String,
+    /// Whether this is a built-in type (always available)
+    pub is_builtin: bool,
+}
+
+/// Response for listing contract types
+#[derive(Debug, Serialize, ToSchema)]
+pub struct ListContractTypesResponse {
+    pub types: Vec<ContractTypeTemplate>,
+}
+
+/// List available contract type templates
+#[utoipa::path(
+    get,
+    path = "/api/v1/contract-types",
+    responses(
+        (status = 200, description = "Contract types retrieved successfully", body = ListContractTypesResponse)
+    ),
+    tag = "contract-types"
+)]
+pub async fn list_contract_types() -> impl IntoResponse {
+    let types = vec![
+        ContractTypeTemplate {
+            id: "simple".to_string(),
+            name: "Simple".to_string(),
+            description: "Plan \u{2192} Execute: Simple workflow with a plan document".to_string(),
+            phases: vec!["plan".to_string(), "execute".to_string()],
+            default_phase: "plan".to_string(),
+            is_builtin: true,
+        },
+        ContractTypeTemplate {
+            id: "specification".to_string(),
+            name: "Specification".to_string(),
+            description: "Research \u{2192} Specify \u{2192} Plan \u{2192} Execute \u{2192} Review: Full specification-driven development with TDD".to_string(),
+            phases: vec![
+                "research".to_string(),
+                "specify".to_string(),
+                "plan".to_string(),
+                "execute".to_string(),
+                "review".to_string(),
+            ],
+            default_phase: "research".to_string(),
+            is_builtin: true,
+        },
+    ];
+
+    (
+        StatusCode::OK,
+        Json(ListContractTypesResponse { types }),
+    )
+        .into_response()
+}
 
 /// Query parameters for listing templates
 #[derive(Debug, Deserialize, ToSchema)]
@@ -105,3 +176,33 @@ pub async fn get_template(
             .into_response(),
     }
 }
+
+// =============================================================================
+// Contract Type Templates (Workflow Definitions)
+// =============================================================================
+
+/// Response for listing contract types
+#[derive(Debug, Serialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct ListContractTypesResponse {
+    pub contract_types: Vec<ContractTypeTemplate>,
+}
+
+/// List all available contract type templates
+#[utoipa::path(
+    get,
+    path = "/api/v1/contract-types",
+    responses(
+        (status = 200, description = "Contract types retrieved successfully", body = ListContractTypesResponse)
+    ),
+    tag = "templates"
+)]
+pub async fn list_contract_types() -> impl IntoResponse {
+    let contract_types = templates::all_contract_types();
+
+    (
+        StatusCode::OK,
+        Json(ListContractTypesResponse { contract_types }),
+    )
+        .into_response()
+}