chore(copy): humanize team-page labels; drop dead org.fit key

Jobs audit item S11: "智能体名册" (Intelligent-agent roster) reads as
machine-generated in a UI whose left navigation already uses the human
word "团队" (Team). The collision between the technical term and the
domain term made the team page feel less real than it is — it is a page
about running an AI company whose members happen to be agents, so the
label should match the nav.

- `org.agentRoster`            "智能体名册"          → "团队成员"
- `org.agentRoster` (en)       "Agent roster"        → "Team members"
- `org.noAgentsYet`            "暂无已招聘的智能体"    → "还没有团队成员"
- `org.noAgentsYet` (en)       "No agents hired yet" → "No team members yet"
- `org.noAgentsDetail` (en)    "Hired agents..."     → "Hired members..."
- `org.hireRequestNote`        Reworded to use "新成员" + tighter flow
- `agent.form.pendingReadOnly` "编辑智能体资料"       → "编辑成员资料"

Technical contexts where "智能体" is the subject matter (skills injection
hint, workload charts, run tables, etc.) are left untouched — the word
is the product's central noun and replacing it everywhere would harm
clarity for users reading technical copy.

Also dropped the dead `org.fit` / "Fit" key — replaced by `org.fitChart`
in commit 50a7196 when the Fit button became an icon. Zero orphaned
callers (verified by grep).

src/renderer/i18n/en.ts

@@ -339,7 +339,7 @@ export const en: Record<string, string> = {
   "hiring.proposedBy": "Proposed by",
 
   // ── Organization page ──
-  "org.agentRoster": "Agent roster",
+  "org.agentRoster": "Team members",
   "org.newHireRequest": "New hire request",
   "org.editAgent": "Edit",
   "org.editAgentTitle": "Edit {name} ({role})",
@@ -704,8 +704,8 @@ export const en: Record<string, string> = {
   "dash.points": "points",
 
   // ── Organization ──
-  "org.noAgentsYet": "No agents hired yet",
-  "org.noAgentsDetail": "Hired agents show up here.",
+  "org.noAgentsYet": "No team members yet",
+  "org.noAgentsDetail": "Hired members show up here.",
   "org.noTitle": "No title",
   "org.noGoalsYet": "No goals defined yet",
   "org.noGoalsDetail": "Goals set the team's priorities.",
@@ -739,7 +739,6 @@ export const en: Record<string, string> = {
   "org.default": "Default",
   "org.model": "Model",
   "org.interval": "Interval",
-  "org.fit": "Fit",
   "org.description": "Description",
   "org.status": "Status",
   "org.statusPlanned": "Planned",