fork: add Gitea/Forgejo source support for company skills

Reintroduce Gitea/Forgejo as a skill import source on dev only, since
the fork deploys against git.farh.net. Pasting a Gitea/Forgejo repo
URL into the skills sidebar mirrors the existing GitHub experience:
pin to a commit SHA, check for updates, read repo files.

Server: new gitea-fetch.ts (URL builders, probe-cache helpers) and
gitea-skills.ts (parse, probe, pin, tree, text, branch). Dispatch in
readUrlSkillImports probes /api/v1/version and routes non-github.com
hosts into the new readGiteaUrlSkillImports branch. updateStatus and
readFile get a gitea arm alongside the github/skills_sh arm. Audit
falls through to "remote not supported" the same way github does.

UI: Server icon, Gitea source label, gitea in the "external" source
class, Pin/Update UI gate widened to sourceType === "gitea". CLI help
text updated. Existing github code is left byte-for-byte unchanged
(wrapped in isGitHubDotCom) so dev <-> master syncs stay clean.

PAT support, gitea portability descriptors, and gitea audit are
deliberate follow-ups. Detection requires /api/v1/version to return
Gitea-shaped JSON; the per-host result is cached for process lifetime
with FIFO eviction at 1024 entries. Non-Gitea hosts fall through to
the existing raw-markdown url branch.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/src/pages/CompanySkills.tsx

@@ -86,6 +86,7 @@ import {
   RefreshCw,
   Save,
   Search,
+  Server,
   ShieldCheck,
   Trash2,
   Users,
@@ -192,6 +193,8 @@ function sourceMeta(sourceBadge: CompanySkillSourceBadge, sourceLabel: string |
       return isSkillsShManaged
         ? { icon: VercelMark, label: sourceLabel ?? "skills.sh", managedLabel: "skills.sh managed" }
         : { icon: Github, label: sourceLabel ?? "GitHub", managedLabel: "GitHub managed" };
+    case "gitea":
+      return { icon: Server, label: sourceLabel ?? "Gitea", managedLabel: "Gitea managed" };
     case "url":
       return { icon: Link2, label: sourceLabel ?? "URL", managedLabel: "URL managed" };
     case "local":
@@ -329,7 +332,7 @@ function classifySource(skill: {
     if (kind === "optional") return "optional";
     return "company";
   }
-  if (skill.sourceBadge === "github" || skill.sourceBadge === "skills_sh" || skill.sourceBadge === "url" || skill.sourceBadge === "local") {
+  if (skill.sourceBadge === "github" || skill.sourceBadge === "skills_sh" || skill.sourceBadge === "gitea" || skill.sourceBadge === "url" || skill.sourceBadge === "local") {
     return "external";
   }
   return "company";
@@ -1512,7 +1515,7 @@ function SkillPane({
                 )}
               </span>
             </div>
-            {detail.sourceType === "github" && (
+            {(detail.sourceType === "github" || detail.sourceType === "gitea") && (
               <div className="flex flex-wrap items-center gap-2">
                 <span className="text-[11px] uppercase tracking-[0.18em] text-muted-foreground">Pin</span>
                 <span className="font-mono text-xs">{currentPin ?? "untracked"}</span>
@@ -1802,7 +1805,7 @@ export function CompanySkills() {
     enabled: Boolean(
       selectedCompanyId
       && selectedSkillId
-      && (detailQuery.data?.sourceType === "github" || displayedDetail?.sourceType === "github"),
+      && (detailQuery.data?.sourceType === "github" || detailQuery.data?.sourceType === "gitea" || displayedDetail?.sourceType === "github" || displayedDetail?.sourceType === "gitea"),
     ),
     staleTime: 60_000,
   });
@@ -2297,7 +2300,7 @@ export function CompanySkills() {
           <DialogHeader>
             <DialogTitle>Add a skill source</DialogTitle>
             <DialogDescription>
-              Paste a local path, GitHub URL, or `skills.sh` command into the field first.
+              Paste a local path, GitHub or Gitea/Forgejo URL, or `skills.sh` command into the field first.
             </DialogDescription>
           </DialogHeader>
           <div className="space-y-3 text-sm">
@@ -2437,7 +2440,7 @@ export function CompanySkills() {
                   <input
                     value={source}
                     onChange={(event) => setSource(event.target.value)}
-                    placeholder="Paste path, GitHub URL, or skills.sh command"
+                    placeholder="Paste path, GitHub or Gitea/Forgejo URL, or skills.sh command"
                     className="w-full bg-transparent text-sm outline-none placeholder:text-muted-foreground"
                   />
                   <Button