feat: integrate sd-card for interactive spec generation (#2)

## Summary

Integrated **sd-card** workflow for interactive specification generation:

- ✅ Added sd-card flake input
- ✅ Created `nix run .#dev` - starts Vite with annotation proxy
- ✅ Updated dev shell with sd-card tools (tea, playwright, nodejs)
- ✅ Replaced old forgejo-workflow with sd-card

## Usage

### Widget-based annotation
```bash
FORGEJO_TOKEN="your-token" nix run .#dev
```

Opens SvelteKit with ✦ widget injected on every page.

### Interactive annotation (recommended)
Ask Claude to interact with the app via Claudezilla:
```
User: "Open solidhaus"
Claude: [opens in Firefox]
User: "Click the scan barcode button"
Claude: [clicks, shows screenshot]
User: "This should open the camera"
Claude: [generates Gherkin scenario]
```

## Test Plan

- [x] Flake builds successfully
- [x] `nix run .#dev` starts dev server with proxy
- [x] Widget injects on pages
- [x] Claudezilla can open and interact with app
- [x] Dev shell includes all sd-card tools

🤖 Generated with Claude Code

Reviewed-on: toph/solidhaus#2
Co-authored-by: Christopher Mühl <toki@toph.so>
Co-committed-by: Christopher Mühl <toki@toph.so>

flake.lock

@@ -0,0 +1,130 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1771848320,
+        "narHash": "sha256-0MAd+0mun3K/Ns8JATeHT1sX28faLII5hVLq0L3BdZU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2fc6539b481e1d2569f25f8799236694180c0993",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1771848320,
+        "narHash": "sha256-0MAd+0mun3K/Ns8JATeHT1sX28faLII5hVLq0L3BdZU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2fc6539b481e1d2569f25f8799236694180c0993",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "sd-card": "sd-card"
+      }
+    },
+    "sd-card": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1772146011,
+        "narHash": "sha256-ZUj4zAAk9shxYOn5jh9Kri4q5O/Aq52OJF43otPMPBE=",
+        "ref": "refs/heads/main",
+        "rev": "307eb15035671c58f9145806067030b59c5d7792",
+        "revCount": 4,
+        "type": "git",
+        "url": "ssh://git@git.toph.so/toph/sd-card"
+      },
+      "original": {
+        "type": "git",
+        "url": "ssh://git@git.toph.so/toph/sd-card"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -4,21 +4,29 @@
   inputs = {
     nixpkgs.url     = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
-    forgejo-workflow.url = "path:/nix/store/1kpd2vzj87rlraw81p4iy4ldw4dm8g6z-forgejo-workflow-setup-flake/bin";
+    sd-card.url     = "git+ssh://git@git.toph.so/toph/sd-card";
   };
 
-  outputs = { self, nixpkgs, flake-utils, forgejo-workflow }:
+  outputs = { self, nixpkgs, flake-utils, sd-card }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
       in
       {
+        packages = {
+          # nix run .#dev — start SvelteKit dev server with annotation proxy
+          dev = sd-card.lib.${system}.mkDevApp {
+            inherit pkgs;
+            devCmd  = "npm run dev";
+            devPort = 5173;  # Vite default port
+          };
+        };
+
         devShells.default = pkgs.mkShell {
-          packages =
+          packages = sd-card.packages.${system}.tools  # tea, jq, playwright, nodejs
-            # Forgejo workflow tools: tea, jq, yq, git, curl
-            forgejo-workflow.packages.${system}.tools
             ++ (with pkgs; [
-              # add your project packages here
+              nodejs
+              nodePackages.npm
             ]);
         };
       }